Relevant bibliographies by topics / Mg2Si

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Mg2Si'

Author: Grafiati
Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Mg2Si"

1

Nordin, Nur Azmah, Saeed Farahany, T. Abubakar, and Esah Hamzah. "Alteration by Cerium Element on Primary and Eutectic Mg2Si Phases in Al-20%Mg2Si In Situ Composite." Advanced Materials Research 1125 (October 2015): 23–27. http://dx.doi.org/10.4028/www.scientific.net/amr.1125.23.

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Owing to its beneficial material properties, Al-Mg2Si in-situ composite has recently received wide attention and application in the manufacture of automotive and aerospace components. Melt treatment of the in-situ composite with the addition of Ce has resulted in a change in the primary and eutectic Mg2Si phases to refined morphology, which would be expected to improve the mechanical properties of the composite. Characteristic parameters of Mg2Si particles have been investigated via thermal and microstructural analysis. This has revealed that the addition of 0.8wt.% Ce produced optimum refinement effects on Mg2SiP because the coarse structure has been changed to a polygonal shape and reduced in size. Similarly, the flake-like morphology of Mg2SiE has been transformed into a rod-like or fibre form in addition to reduction of the eutectic cell area. The result also showed an increase in nucleation temperature TN of Mg2SiP while depressed for Mg2SiE, which also corresponds to the refinement morphology effect.
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Chegini, Mahdi, Mohammad Shaeri, Reza Taghiabadi, Sajjad Chegini, and Faramarz Djavanroodi. "The Correlation of Microstructure and Mechanical Properties of In-Situ Al-Mg2Si Cast Composite Processed by Equal Channel Angular Pressing." Materials 12, no. 9 (May 12, 2019): 1553. http://dx.doi.org/10.3390/ma12091553.

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In this paper, the effect of equal channel angular pressing (ECAP) on microstructure and mechanical properties of hypereutectic Al-20%Mg2Si and Al-15%Mg2Si, as well as hypoeutectic Al-10%Mg2Si composites has been investigated. After fabricating the composites by in-situ casting, the composites were processed using the ECAP process up to two passes at room temperature. Microstructural studies have been carried out using a field emission scanning electron microscopy equipped with an energy dispersive X-ray spectrometer. Mechanical properties were also documented using Vickers microhardness and shear punch tests. In the hypereutectic composites, a decrease in the average size of pro-eutectic Mg2Si (Mg2Sip) particles, breakages in eutectic networks, and lengthening of the Al (α) phase in direction of shear bands were observed after the ECAP process. For instance, the average size of Mg2Sip Particles in Al-20%Mg2Si composite reduced from 40 to 17 μm after 2 passes of ECAP. Furthermore, a uniform distribution of Mg2Sip particles was developed in the matrix. In hypoeutectic composite, the ECAP process caused a uniform distribution of eutectic Mg2Si (Mg2SiE) in the matrix that considered a favorable microstructure. Microhardness measurements and shear punch results showed an ascending trend after each pass of ECAP for all specimens. For example, microhardness and shear strength of Al-20%Mg2Si increased from 88 HV and 109 MPa to 119 HV and 249 MPa after two passes indicating 35% and 34% increments, respectively. Density and porosity calculations by Archimedes principle revealed that the density of the composites increased after two passes of ECAP due to the reduction of porosity.
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Aizawa, Tatsuhiko, Ren Bo Song, and Atsushi Yamamoto. "Thermoelectric Material Design in Pseudo Binary Systems of Mg2Si – Mg2Ge – Mg2Sn on the Powder Metallurgy Route." Materials Science Forum 534-536 (January 2007): 1553–56. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.1553.

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Fundamental studies on the thermoelectricity have been mainly done in the pseudo binary systems of Mg2Si – Mg2Ge – Mg2Sn. In recent years, their thermoelectricity is revisited because of light-weight, low initial const and short turning back time in addition to high potential in figureof- merit for ZT approaching to unity or more. Conventional melting and solidification, or, normal PM routes fail in precise, wide-range control of chemical composition and microstructure control. New PM route via bulk mechanical alloying is developed to fabricate the solid solution semiconductive materials with Mg2Si1-xGex and Mg2Si1-ySny for 0 < x, y < 1 and to investigate their thermoelectric materials. Since Mg2Si is n-type and both Mg2Ge and Mg2Sn are p-type, pntransition takes place at the specified range of germanium content, x, and tin content, y. Through optimization of chemical composition, solid-solution type thermoelectric semi-conductive materials are designed both for n- and p-type materials. In addition, appropriate doping condition can be searched in the specified range of x and y.
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Kasai, Hidetaka, Lirong Song, Henrik Lyder Andersen, Hao Yin, and Bo Brummerstedt Iversen. "Multi-temperature structure of thermoelectric Mg2Si and Mg2Sn." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 73, no. 6 (November 24, 2017): 1158–63. http://dx.doi.org/10.1107/s2052520617014044.

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A multi-temperature structural study of Mg2Si and Mg2Sn was carried out from 100 to 700 K using synchrotron X-ray powder diffraction. The temperature dependence of the lattice parameters can be expressed as a = 6.3272 (4) + 6.5 (2) × 10−5 T + 4.0 (3) × 10−8 T 2 Å and a = 6.7323 (7) + 8.5 (4) × 10−5 T + 3.8 (5) × 10−8 T 2 Å for Mg2Si and Mg2Sn, respectively. The atomic displacement parameters (ADPs) are reported and analysed using a Debye model for the averaged U iso giving Debye temperatures of 425 (2) K for Mg2Si and 243 (2) K for Mg2Sn. The ADPs are considerably smaller for Mg2Si than for Mg2Sn reflecting the weaker chemical bonding in the Mg2Sn structure. Following the heating, an annealing effect is observed on the lattice parameters and peak widths in both structures, presumably due to changes in the crystal defects, but the lattice thermal expansion is almost unchanged by the annealing. This work provides accurate structural parameters which are of importance for studies of Mg2Si, Mg2Sn and their solid solutions.
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Fu, Xuesong, Yan Yang, QuanYang Ma, Xiaodong Peng, and Tiancai Xu. "Microstructure and Mechanical Behavior of Mg-0.5Si-xSn Alloys." Archives of Foundry Engineering 17, no. 4 (December 20, 2017): 179–84. http://dx.doi.org/10.1515/afe-2017-0154.

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AbstractMg-0.5Si-xSn (x=0.95, 2.9, 5.02wt.%) alloys were cast and extruded at 593K (320oC) with an extrusion ratio of 25. The microstructure and mechanical properties of as-cast and extruded test alloys were investigated by OM, SEM, XRD and tensile tests. The experimental results indicate that the microstructure of the Mg-0.5Si-xSn alloys consists of primary α-Mg dendrites and an interdendritic eutectic containing α-Mg, Mg2Si and Mg2Sn. There is no coarse primary Mg2Si phase in the test alloys due to low Si content. With the increase in the Sn content, the Mg2Si phase was refined. The shape of Mg2Si phase was changed from branch to short bar, and the size of them were reduced. The ultimate tensile strength and yield strength of Mg-0.52Si-2.9Sn alloy at the temperature of 473K (200oC) reach 133MPa and 112MPa respectively. Refined eutectic Mg2Si phase and dispersed Mg2Sn phase with good elevated temperature stability are beneficial to improve the elevated temperature performance of the alloys. However, with the excess addition of Sn, large block-like Mg2Sn appears around the grain boundary leading to lower mechanical properties.
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Rzychoń, T., and B. Dybowski. "The Influence of Aluminum on the Microstructure and Hardness of Mg-5Si-7Sn Alloy." Archives of Metallurgy and Materials 61, no. 1 (March 1, 2016): 425–32. http://dx.doi.org/10.1515/amm-2016-0077.

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Magnesium alloys due the low density and good mechanical properties are mainly used in the automotive and aerospace industry. In recent years, magnesium alloys are extensively developed for use in high temperatures (above 120°C). Among these alloys, magnesium alloys containing tin and silicon have large possibilities of application due to the formation of thermally stable intermetallic Mg2Sn and Mg2Si. In this paper the influence of aluminum and heat treatment on the on the microstructure and hardness of Mg-7Sn-5Si alloy is reported. It was found that the microstructure of Mg-7Sn-5Si alloy consist of α-Mg solid solution, Mg2Sn and Mg2Si compounds. Addition of 2 wt% of Al to Mg-7Sn-5Si alloy causes the formation of Al2Sn phase. Moreover, Al dissolves in the α-Mg solid solution. The solution heat-treatment of tested alloys at 500°C for 24 h causes the dissolve the Mg2Sn phase in the α-Mg matrix and spheroidization of Mg2Si compound. The Mg2Si primary crystals are stable at solution temperature. After ageing treatment the precipitation process of equilibrium Mg2Sn phase was found in both alloys. The addition of aluminum has a positive effect on the hardness of Mg-7Sn-5Si alloy. In case of Mg-5Si-7Sn-2Al alloy the highest hardness was obtained for sample aged for 148 h at 250°C (88 HV2), while in case of Al-free alloy the highest hardness is 70 HV for material aged for 148 h at 250°C.
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Rzychoń, Tomasz. "Microstructure of Hypereutectic Mg-Si Alloy with Sn, Al and Mn Additions." Solid State Phenomena 229 (April 2015): 65–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.229.65.

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In the present study, the microstructure of Mg-5Si alloys with tin, aluminum and manganese was investigated. The microstructure of Mg-5Si alloy consists of the primary coarse Mg2Si phase, α-Mg solid solution and eutectic α-Mg + Mg2Si in which the eutectic Mg2Si phase solidifies in the form of Chinese script particles. The Mg2Sn phase and α-Mg solid solution with tin appear in the microstructure, when 7 wt.% of Sn was added to the Mg-5Si alloy. Aluminum dissolve in the α-Mg matrix and participates in the formation of Al2Sn phase. The addition of manganese promotes the formation of Mn5Si3 compound.
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Rzychoń, Tomasz, Bartosz Chmiela, Adrian Mościcki, Bartłomiej Dybowski, and Sylwia Jendrysko. "The Influence of Heat Treatment on the Microstructure and Hardness of Mg-5Si-7Sn-5Mn Alloy." Solid State Phenomena 229 (April 2015): 83–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.229.83.

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The microstructure and hardness of as-cast Mg-5Si-7Sn-5Mn alloy after solution and ageing treatments is presented in this paper. It was found that the microstructure of as-cast alloy. is composed of primary dendrites crystals of Mg2Si phase, α-Mg matrix, long needle-like precipitates of Mn5Si3, Chinese script particles of Mg2Si phase and irregular Mg2Sn phase. The solution treatment at 500°C causes the dissolution of the Mg2Sn phase in the α-Mg magnesium solid solution, whereas the remaining intermetallic compounds are stable in this temperature. The hardness of alloy increases from 73 HV2 to 96 HV2 at 250°C. The increase in hardness is a result of the formation of the lath-like precipitates of Mg2Sn phase within the α-Mg matrix.
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Song, Dae Hyun, C. W. Lee, K. Y. Nam, S. W. Lee, Y. H. Park, Kyung Mok Cho, and Ik Min Park. "Microstructural Characteristics and Creep Properties of Mg-5Al-2Si Alloys Modified with Sn and Sr." Materials Science Forum 539-543 (March 2007): 1784–89. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1784.

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The effects of tin (Sn) and strontium (Sr) additions on the microstructure and creep properties of Mg-5Al-2Si (AS52) alloys were investigated. Results showed that the addition of Sn did not affect the morphology of secondary phase Mg2Si particles but induced the fine and uniform precipitation of thermally stable Mg2Sn at the grain boundary in the AS52 alloys. However, the morphology modification of the secondary phase Mg2Si particles from Chinese script shape to refined polygonal shape was greatly affected by the addition of Sr. Tensile strength and creep resistance were improved and tensile elongation was also increased in the modified alloy with addition of both Sr and Sn. Sn is the effective element for precipitating thermally stable Mg2Sn finely and uniformly at the grain boundary and Sr is the effective element for refining microstructure. Therefore both Sn and Sr are effective for modifying the microstructure and improving the creep properties of AS52 alloys.
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Uematsu, Yoshihiko, Keiro Tokaji, and Mitsutoshi Kamakura. "Fatigue Behaviour of Extruded Mg2Si-Reinforced Magnesium Alloy." Key Engineering Materials 345-346 (August 2007): 223–26. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.223.

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Rotary bending fatigue tests were conducted in order to investigate the fatigue behaviour and fracture mechanisms of extruded Mg2Si-reinforced magnesium (Mg) alloys. Mg2Si particles were mixed with Mg alloy (AZ31) powder to form billets and then extruded at two different working temperatures of 685K and 646K, where the materials extruded at high and low temperatures were denoted as Mg2Si-H and Mg2Si-L, respectively. The grains of the matrix were finer in Mg2Si-L than in Mg2Si-H. The proof stress and tensile strength were independent of working temperature and increased compared with a conventional extruded AZ31 alloy, with a decreased in ductility. The fatigue strength of Mg2Si-H was almost the same as that of the extruded AZ31 alloy, but the fatigue limit was lower, while the fatigue strength of Mg2Si-L was higher than that of Mg2Si-H and the extruded AZ31 alloy. Both crack initiation and crack growth resistances in Mg2Si-L were improved, which could be attributed to high bonding strength of Mg2Si/Mg interfaces and fine grain refinement of the matrix.
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Dissertations / Theses on the topic "Mg2Si"

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Esch, David J. N. "Transverse Thermoelectric Properties of Cu/Mg2Si and Ni/Mg2Si Artificially Anisotropic Materials." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/1967.

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In this thesis the spark plasma sintering process (SPS) was used to press Mg2Si powder with Ni and Cu slices into alternating layer stacks. These stacks, once cut at an angle, are an artificially anisotropic material. This anisotropy provides transverse thermoelectric properties to the sample. The transverse transport properties were measured along with the individual component transport properties. The SPS process provided malleable samples that gave a power factors of for the Ni/Mg2Si stack and for the Cu/Mg2Si stack. These fall short of the theoretical calculations which would give the power factors as .0254 for the Ni/Mg2Si stack and .211 for the Cu/Mg2Si stack. It is theorized that eddy currents and interface resistances between the layers are the causes for these discrepancies.
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Le, Quoc Huy. "Matériaux thermoélectriques du type Mg2Si-Mg2Sn élaborés en couches minces par co-pulvérisation assistée par plasma." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENY072/document.

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Cette thèse présente une étude de l'élaboration et des propriétés structurales, ainsi que des propriétés électriques, des couches minces de matériaux thermoélectriques de type Mg2Si-Mg2Sn. Les couches minces polycristallines du composé Mg2Sn et des solutions solides Mg2Si1-xSnx ont été réalisées sur plusieurs types de substrat, à température ambiante, par la technique de dépôt par co-pulvérisation assistée par plasma micro-onde multi-dipolaire. L'influence des paramètres de dépôt sur les propriétés structurales et électriques des couches élaborées a été étudiée. Ainsi, la composition chimique des couches a été parfaitement contrôlée par le biais de la polarisation indépendante des cibles des éléments constituants. La composition de phase, ainsi que la microstructure des couches, ont été trouvées dépendant de la pression de dépôt, de la distance entre des cibles et le substrat, de la puissance micro-onde et de la configuration du réacteur de dépôt. Ces propriétés structurales, à leur tour, ont un fort impact sur les propriétés électriques des couches déposées. Les couches minces Mg2Sn dopé en Ag, déposées avec la condition de dépôt optimale, ont présenté un facteur de puissance à température ambiante comparable à celui des matériaux actuellement utilisés. Les couches minces des solutions solides Mg2Si1-xSnx présentent, pourtant, des facteurs de puissance encore modestes résultant notamment des faibles conductivités électriques
This thesis presents a study of the deposition and structural as well as electrical properties of thin films of thermoelectric materials Mg2Sn-Mg2Si. Polycrystalline thin films of the Mg2Sn compound and solid solutions Mg2Si1-xSnx were deposited on several types of substrate at room temperature, by co-sputtering assisted by microwave plasma. The influence of deposition parameters on structural and electrical properties of deposited films was studied. Thus, the chemical composition of layers was fully controlled by the means of the independent polarization of target of constituent elements. Phase composition and microstructure of deposited films were found depending on the deposition pressure, on the distance between targets and the substrate, on the microwave power, as well as on the configuration of the deposition reactor. These structural properties, in turn, have a strong impact on the electrical properties of the deposited films. Mg2Sn thin films doped with Ag, deposited under optimal condition, presented a power factor at room temperature comparable to conventional thermoelectric materials. Thin films of solid solutions Mg2Si1-xSnx present, however, power factors still modest due in particular to low electrical conductivities
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Le-Quoc, Huy. "Matériaux thermoélectriques du type Mg2Si−Mg2Sn élaborés en couches minces par co-pulvérisation assistée par plasma." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00687307.

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Les travaux présentés dans cette thèse portent sur l'élaboration des couches minces de matériaux thermoélectriques de type Mg2Si-Mg2Sn, et sur l'étude de leurs propriétés structurales et électriques. Des couches minces polycristallines du composé Mg2Sn et des solutions solides Mg2Si1-xSnx ont été réalisées sur plusieurs types de substrat, à température ambiante, par la technique de dépôt par co-pulvérisation assistée par plasma micro-onde multi-dipolaire. L'influence des paramètres de dépôt sur les propriétés structurales et électriques des couches élaborées a été étudiée. Les résultats obtenus démontrent clairement que la composition chimique des couches est parfaitement contrôlée par le biais de la polarisation indépendante des cibles des éléments constituants. Cette étude met également en évidence que la composition de phase et la microstructure des couches dépendent des paramètres opératoires : pression du gaz plasmagène, puissance micro-onde, géométrie (distance cibles-substrat, configuration du réacteur de dépôt). Les propriétés structurales ont un fort impact sur les propriétés électriques des couches déposées. Un facteur de puissance comparable, à température ambiante, à celui des matériaux actuels (Bi-Te) a été déterminé pour les couches minces Mg2Sn dopées en Ag. Une grande avancée de cette étude a été de prouver l'obtention des couches minces des solutions solides Mg2Si1- xSnx monophasées. Des améliorations sont proposées pour l'augmentation de la conductivité électrique et donc du facteur de puissance de ces couches.
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Le, quoc Huy. "Matériaux thermoélectriques du type Mg2Si-Mg2Sn élaborés en couches minces par co-pulvérisation assistée par plasma." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00859213.

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Cette thèse présente une étude de l'élaboration et des propriétés structurales, ainsi que des propriétés électriques, des couches minces de matériaux thermoélectriques de type Mg2Si-Mg2Sn. Les couches minces polycristallines du composé Mg2Sn et des solutions solides Mg2Si1-xSnx ont été réalisées sur plusieurs types de substrat, à température ambiante, par la technique de dépôt par co-pulvérisation assistée par plasma micro-onde multi-dipolaire. L'influence des paramètres de dépôt sur les propriétés structurales et électriques des couches élaborées a été étudiée. Ainsi, la composition chimique des couches a été parfaitement contrôlée par le biais de la polarisation indépendante des cibles des éléments constituants. La composition de phase, ainsi que la microstructure des couches, ont été trouvées dépendant de la pression de dépôt, de la distance entre des cibles et le substrat, de la puissance micro-onde et de la configuration du réacteur de dépôt. Ces propriétés structurales, à leur tour, ont un fort impact sur les propriétés électriques des couches déposées. Les couches minces Mg2Sn dopé en Ag, déposées avec la condition de dépôt optimale, ont présenté un facteur de puissance à température ambiante comparable à celui des matériaux actuellement utilisés. Les couches minces des solutions solides Mg2Si1-xSnx présentent, pourtant, des facteurs de puissance encore modestes résultant notamment des faibles conductivités électriques.
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Balout, Hilal. "Thermoelectric properties of Mg2Si-based systems investigated by combined DFT and Boltzmann theories." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4301.

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Les propriétés électroniques et thermoélectriques de matériaux basés sur Mg2Si ont été étudiées par calculs DFT et semi-classiques (théorie de Boltzmann). Les effets d’abaissement de dimensionalité et de contraintes ont été étudiés. Les calculs ont été effectués sur les films monocristallins orientés 001, 110 et 111 et sur les films polycristallins. Seul le film monocristallin orienté 110 a montré des propriétés thermoélectriques intéressantes. Trois types de contraintes ont été investiguées: uniaxiale, biaxiale et isotrope. L’augmentation de la contrainte sur Mg2Si produit un décalage du maximum du facteur de puissance (PF) vers les basses températures. Comparé à Mg2Si non contraint, le coefficient Seebeck (S) augmente uniquement sous contrainte isotrope. On montre l’équivalence des propriétés thermoélectriques entre Mg2Si contraint dans la direction [110] et celles du film orienté 110. Les contraintes de tension isotropes ont été modélisées en insérant des atomes Sb dans Mg2Si massif conduisant aux structures Mg2Si:Sb, Mg2Si:3Sb and Mg2Si:4Sb. Seul Mg2Si:4Sb produit une contrainte isotrope. Les effets de substitutions de Sn pour Si dans Mg2Si massif sont similaires à ceux observés pour Mg2Si sujet à des contraintes en tension uniaxiales et biaxiales. Pour les films Mg2Si1−xSnx orientés 110 le S du matériau dopé p est supérieur à celui des massifs Mg2Si et Mg2Si1−xSnx. Concernant les nanostructures, le super-réseau Mg2Si/Mg2Sn est le plus intéressant lorsque faiblement dopé p et à basse température. Les assemblages de fils sont les meilleurs en tant que matériaux faiblement dopés n et à basse température: le PF est quasiment doublé par rapport à celui de Mg2Si massif
The electronic and thermoelectric properties of Mg2Si-based materials have been investigated by means of DFT calculations and semi-classical Boltzmann theory. The low-dimensional and strain effects on these properties have been studied. The properties have been investigated on 001-, 110- and 111-oriented Mg2Si monocrystalline films, and on polycrystalline Mg2Si film. Only the 110-oriented monocrystalline film has been found to have interesting thermoelectric properties. Three types of strains have been investigated: uniaxial, biaxial and isotropic. Increasing the intensity of the strain on Mg2Si induces a shift of the power factor (PF) maximum towards low temperature. Compared with unstrained Mg2Si, the Seebeck coefficient (S) increases only under isotropic strain. We evidence an equivalence in the thermoelectric properties between Mg2Si material constrained in the [110] direction and the 110-oriented Mg2Si film. Isotropic tensile strains have been modeled by inserting Sb atoms in bulk Mg2Si leading to the stuctures Mg2Si:Sb, Mg2Si:3Sb and Mg2Si:4Sb. Only Mg2Si:4Sb is found to induces such type of constraints. The effects of the Sn for Si substitutions in bulk Mg2Si are very similar to those observed for Mg2Si subjected to uniaxial and biaxial tensile strains. For (110)-oriented Mg2Si1−xSnx films S of the n−doped material outperforms that of the bulk Mg2Si and bulk Mg2Si1−xSnx. Regarding nanostructures, the Mg2Si/Mg2Sn superlattice is most interesting as a p-doped material at low carrier concentration/low temperature. The stick assemblage is best as a n-doping material at low carrier concentration/low temperature where its PF is almost twice as high as that of bulk Mg2Si
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Uyma, Falko. "Untersuchungen auf dem Gebiet der Al-Mg-Si- und Al/Mg2Si-in-situ Legierungen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek &quot;Georgius Agricola&quot, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:105-366350.

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Das Ziel dieser Arbeit bestand in der Entwicklung eines Werkstoffes auf Basis der Legierung AlSi13,5Mg9,5 (=Al-15Mg2Si-8Si), die sich durch ein verbessertes Verschleißverhalten, geringere thermische Ausdehnung und geringere Dichtewerte auszeichnet. Eine wesentliche Aufgabe der Arbeit bestand in der Einstellung bester mechanischer Eigenschaften durch die Feinung der Primär-Phase (Mg2Si) sowie durch Mikrolegieren. Ausbleibende Resultate begründeten die Wahl einer angepassten Legierungszusammensetzung AlMg8,6Si6,4 (=Al-14Mg2Si-1Si). Versuche zur Eigenschaftsoptimierung (Mikrolegieren, Wärmebehandlung) zeigten neben der Ermittlung der gießtechnischen Eigenschaften die spezifischen Legierungscharakteristika auf. Die Verarbeitung des optimierten Werkstoffes mit verschiedenen Verfahren machte die Abhängigkeit der Ausbildung der mechanischen Eigenschaften sowie des Gefüges deutlich. Die Untersuchung der thermo-physikalischen Eigenschaften sowie die Analyse der Wechselwirkungen zwischen Risswachstum und Gefüge runden die Beschreibung des Eigenschaftsprofiles ab.
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Ellendt, Nils [Verfasser]. "Einfluss der Prozessparameter auf Porosität und Mikrostruktur sprühkompaktierter übereutektischer Al-Mg2Si-Legierungen / Nils Ellendt." Aachen : Shaker, 2010. http://d-nb.info/108188598X/34.

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Yan, Feng. "Development of high strength Al-Mg2Si-Mg based alloy for high pressure diecasting process." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/13883.

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Aluminium alloys are the most promising lightweight materials used in the automotive industry to achieve weight reduction for improving fuel efficiency and reducing CO2 emissions. High pressure diecasting (HPDC) is a fast and economical near-net shape manufacturing method to produce engineering components. About 80% of cast aluminium alloys are currently manufactured by HPDC. The increased demands of manufacturing structural components by HPDC process require high strength Al-alloys for the automotive industry. However, the currently available die cast Al-alloys are unable to fulfil this requirement. Al-Mg2Si alloy is known as an alloy capable of providing superior high strength by Mg2Si particles. However, Al-Mg2Si alloy is not applicable in the HPDC process because of the severe die soldering problem. This has limited its applications throughout industries. Moreover, the existing studies on the Al-Mg2Si alloy are mainly focused on the hyper-eutectic alloys and limited information is available for hypo-eutectic alloys. Generally, the mechanical properties of Al-alloys are determined by the alloy composition, the defect levels in the components, the microstructure which is mainly controlled by the casting process and heat treatment process. Due to the high cooling rate provided by the die block in the HPDC process, the refined microstructure in the die cast Al-Mg2Si alloys can be obtained to improve the mechanical properties. Therefore, the development of high strength Al-Mg2Si based alloys for the HPDC process is significant for manufacturing quality automotive components. The present study mainly focuses on the alloy development for the HPDC process. In order to make die castable Al-Mg2Si based alloys, the effect of excess Mg has been investigated to modify the hypo-eutectic Al-Mg2Si system for improving the mechanical properties. The effect of excess Mg on the solidification and microstructural evolution, and the mechanical properties of Al-Mg2Si alloys, has also been investigated by the combination of thermodynamic calculation and the experimental validation. The excess Mg in the hypo-eutectic Al-Mg2Si alloys has been found to be able to shift the eutectic composition to a lower Mg2Si content, which means that the hypo-eutectic composition of Al-Mg2Si alloy can be at eutectic or hyper-eutectic compositions after adding different levels of excess Mg. The experimental trials have also found that Al-8Mg2Si-6Mg alloy provides the best combination of strength and ductility in the as-cast castings made by the HPDC process. This can be further enhanced by adding 0.6wt.% Mn, which exhibits yield strength of 189MPa, UTS of 350MPa, and elongation of 6.5%. Investigations have also revealed that the Al-8Mg2Si-6Mg alloy exhibits a relatively high tolerance to the Fe impurity because of the insignificant reduction of ductility of the alloy. The elongation is still at a level of 5% when Fe is at 1.6wt.% in the alloy. Furthermore, Cu and Zn can further enhance the mechanical properties of the Al-8Mg2Si-6Mg-0.6Mn alloy. Cu contents between 0.31wt.% and 0.92wt.% in the Al-8Mg2Si-6Mg-0.6Mn alloy can increase the yield strength from 193MPa to 207MPa, but decrease the UTS from 343MPa to 311MPa, and the elongation from 4.8% to 3.8% under as-cast condition. This can be attributed to the formation of hot tearing defects in castings. Therefore, the Cu content in the alloy should be limited to a low level. On the other hand, zinc can be controlled to a level of 4.3wt.%, which will dramatically increase the tensile strength of the alloy. More importantly, Zn can significantly increase the mechanical properties of the alloy after a quick T6 heat treatment under a condition of solution at 490oC for 15 mins and ageing at 180oC for 90 mins, at which the yield strength is 345MPa, UTS is 425MPa, and elongation is 3.2 %. In the present study, the solidification and microstructural evolution, the relationship between the microstructure and mechanical properties, and the strengthening mechanisms in the developed alloy are discussed on the basis of the experimental results. A two stage solidification has been recognised to be responsible for the microstructure formation in the HPDC process. The primary α-Al phase is formed as prior phase for the hypo-eutectic alloy and the primary Mg2Si phase is formed as prior phase for the hyper-eutectic alloy. The solute elements including Mg, Mn, Fe, Cu, and Zn can enhance the solution strengthening and/or the precipitation strengthening in the alloys, but alter the solidification ranges, which will affect the formation of defects in the castings. In the quick T6 heat treatment, the AlMgZn phase is dissolved into the Al phase during solution treatment and precipitated during ageing treatment. The quick heat treatment is also found to be able to spheroidise the Mg2Si phase. Only η′ MgZn phase is precipitated during aging in Zn containing alloys. The alloy with 4.3wt.% Zn provides the best combination of the mechanical properties because of the high density of MgZn precipitates in the α-Al phase.
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Dedov, Stanislav. "Untersuchungen zur Entwicklung einer kombinierten Gieß-Umformtechnologie zur Herstellung hochwertiger Aluminium Bauteile." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-128707.

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Die steigende Bedeutung des Leichtbaus in der modernen Fahrzeugtechnik stellt stetig neue technologische Herausforderungen an die Hersteller. Dabei rückt die Entwicklung neuer energetisch effizienter Herstellungsverfahren sowie geeigneter Werkstoffe immer weiter in den Vordergrund. In der vorliegenden Arbeit wird die Entwicklung eines zukunftsorientierten kombinierten Gieß-Umformverfahrens zur Herstellung hochfester Aluminiumbauteile, z.B. für die Automobilindustrie, vorangetrieben. Die Anwendung aushärtbarer Aluminiumlegierungen, insbesondere mit höheren Siliziumgehalten, wird betrachtet. Der Schwerpunkt der Arbeit liegt in der Ermittlung und Begründung günstiger Prozessbedingungen für einzelne Prozessschritte von Aluminiumbauteilen (Gießen, Umformen, Warm-, bzw. Kaltauslagern) im Zusammenhang mit dem Siliziumgehalt der Legierung. Die Übertragung der gewonnenen Erkenntnisse auf die Verhältnisse des kombinierten Gieß-Umformverfahrens in einen industrienahen Maß-stab stellte ein weiteres Ziel der Arbeit dar.
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Contatori, Chester. "Efeitos do cobre e do magnésio na microestrutura da liga Al-19%Si fundida por centrifugação." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-29012018-143638/.

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As ligas de alumínio hipereutéticas fundidas por centrifugação apresentam a possibilidade de obtenção de um gradiente funcional de propriedades no material (Functionally Graded Material - FGM). Na fundição por centrifugação, os compostos menos densos tenderão a se concentrar no diâmetro interno de um tubo centrifugado. Como a massa específica do silício e do Mg2Si são menores do que a do alumínio, as partículas dessas fases tendem a concentrar-se na parede interna de tubos centrifugados. Em função disto, este estudo tem como objetivo dar uma contribuição ao entendimento dos mecanismos de migração das partículas de silício e de Mg2Si numa liga de alumínio hipereutética com 19% de silício e com adições de cobre e magnésio fundidas por centrifugação. Diante disto, foram obtidos tubos da liga Al-19%Si com adições de até 5% de cobre e 5% de magnésio por meio da fundição centrífuga numa rotação de 1700 rpm. A caracterização microestrutural em diversas regiões dos tubos centrifugados foi feita utilizando-se a microscopia óptica e eletrônica de varredura com sistema de análise de imagens. A fração das fases presentes e a dureza Vickers foram determinadas ao longo da parede do tubo em diversas posições de vazamento. A fundição centrífuga promove a segregação de partículas de silício primário e de Mg2Si, com massas específicas menores para a parede interna do tubo. Esta segregação é mais acentuada na região final de vazamento devido ao maior tempo de centrifugação até a solidificação. Uma retenção de partículas junto à parede externa do tubo ocorre em decorrência da mais elevada taxa de resfriamento da liga fundida em contato com a parede do molde mais frio. Esta retenção também foi maior na região do tubo de início de vazamento em relação à de final de vazamento. A adição de cobre intensificou a migração das partículas devido ao aumento da densidade do líquido. O aumento do teor de cobre na liga também inibiu a presença de dendritas de alumínio primário que ocorrem em grandes quantidades nas regiões centrais das paredes dos tubos centrifugados. O perfil de dureza ao longo da parede do tubo indicou um aumento de dureza relacionado diretamente à quantidade de partículas de silício (β) e Mg2Si.
A functionally gradient material, in terms of its properties, can be obtained with centrifugally cast hypereutectic aluminum alloys. In centrifugal casting, the less dense compounds tend to concentrate close to the inner wall of a centrifugally cast tube. Since the specific mass of silicon and Mg2Si are less than that of aluminum, particles of these phases tend to concentrate at the inner walls of centrifugally cast tubes. On the basis of this, the aim of this study was to contribute towards increased understanding of the mechanism of segregation of silicon and Mg2Si particles in a centrifugally cast hypereutectic aluminum - 19% silicon alloy to which copper and magnesium were added. Hence, tubes of Al-19%Si alloy with up to 5% copper and up to 5% magnesium were centrifugally cast at rotational speed of 1700 rpm. Microstructural examination of various regions of the centrifugally cast tubes was carried out using an optical microscope and a scanning electron microscope coupled to an image analyzer. The amount of phases that formed and the Vickers hardness were determined across the thickness of the tube at different positions. Centrifugal casting promotes segregation of primary silicon and Mg2Si particles, (with lower specific weights) towards the inner walls of the tube. This segregation was higher at regions that were last to be cast, and due to longer centrifugation until solidification. Retention of particles close to the outer wall of the tube took place due to higher cooling rate of the cast alloy in contact with the cold walls of the mold. This retention was also higher at regions of the tube that were cast first compared with those that were cast last. The addition of copper increased particle migration due to increase in density of the liquid. Increase in the amount of copper in the alloy also inhibited the presence of primary aluminum dendrites that form in large quantities at the central regions of centrifugally cast tube walls. The hardness profile along the tube wall indicated an increase in hardness and this is directly related to the quantity of (β) silicon and Mg2Si particles.
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Book chapters on the topic "Mg2Si"

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Nordin, Nur Azmah, Saeed Farahany, Tuty Asma Abu Bakar, Ali Ourdjini, Saiful Amri Mazlan, Siti Aishah Abdul Aziz, and Hafizal Yahaya. "Effect of Barium on the Structure and Characteristics of Mg2Si Reinforced Particles Al–Mg2Si–Cu in Situ Composite." In Proceedings of the 6th International Conference and Exhibition on Sustainable Energy and Advanced Materials, 265–74. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4481-1_26.

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Bogala, Mallikharjuna R., and Ramana G. Reddy. "Synthesis, Characterization and Gibbs Energy of Thermoelectric Mg2Si." In Processing, Properties, and Design of Advanced Ceramics and Composites: Ceramic Transactions, 141–51. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119323303.ch12.

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Azarbarmas, Mortaza, Masoud Emamy, Jafar Rassizadehghani, Mohammad Alipour, and Mostafa karamouz. "Modification of Al-Mg2Si In Situ Composite by Boron." In Supplemental Proceedings, 843–50. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062142.ch102.

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Shu-cai, ZHOU, BAI Chen-guang, and FU Chun-lin. "Reaction Sintering of Mg2Si Thermoelectric Materials by Microwave Irradiation." In Magnesium Technology 2012, 489–92. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48203-3_87.

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Shu-cai, ZHOU, BAI Chen-guang, and FU Chun-lin. "Reaction Sintering of Mg2Si Thermoelectric Materials by Microwave Irradiation." In Magnesium Technology 2012, 489–92. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118359228.ch89.

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Pabel, Thomas, Tose Petkov, Christian Kneissl, and Peter Schumacher. "Modification of the Eutectic Mg2Si-Phase of AlMgSi-Cast Alloys." In Light Metals 2013, 303–4. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118663189.ch52.

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Pabel, Thomas, Tose Petkov, Christian Kneissl, and Peter Schumacher. "Modification of the Eutectic Mg2si-Phase of AlMgSi-Cast Alloys." In Light Metals 2013, 303–4. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-65136-1_52.

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Sun, Yiwei, David R. Johnson, Kevin P. Trumble, Pikee Priya, and Matthew John M. Krane. "Effect of Mg2Si Phase on Extrusion of AA6005 Aluminum Alloy." In Light Metals 2014, 429–33. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48144-9_73.

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Lus, Hiiseyin Murãt, Gökhan Ozer, and Kerem Altug Guler. "In Situ Composite of (Mg2Si)/Al Fabricated by Squeeze Casting." In Supplemental Proceedings, 775–81. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118356074.ch97.

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Sun, Yiwei, David R. Johnson, Kevin P. Trumble, Pikee Priya, and Matthew John M. Krane. "Effect of Mg2Si Phase on Extrusion of AA6005 Aluminum Alloy." In Light Metals 2014, 429–33. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888438.ch73.

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Conference papers on the topic "Mg2Si"

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Shanmugavel, Balasivanandha Prabu, and Vijayakumar Mohan. "Wear Behavior of In-Situ Mg2Si/Al-Si Composite." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11408.

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Abstract An in-situ Mg2Si/Al-Si composite was produced by the in-situ reaction approach. The in-situ Mg2Si particles were produced in an aluminum alloy (LM-6) melt due to the reaction between Potassium hexafluorotitanate (K2TiF6) and magnesium in the aluminium melt. The melt was maintained at 750°C for 30 minutes’ duration to complete the in-situ reaction. The microstructure examination revealed the homogeneous distribution of Mg2Si particles in the Al-Si matrix. The formation of the Mg2Si phase was confirmed by the X-Ray Diffraction technique. The Hardness measured on the composite is higher than that of the Aluminium alloy (LM-6). The wear behavior of both the materials was investigated using Pin-on-disk wear testing by considering parameters, such as loads (20N, 40N), sliding distance (1000m,1800m) and velocity (1.5m/s, 2m/s). The Signal to Noise (S/N) ratio was calculated to identify the parameters at which higher wear resistance was offered by both the materials. The experimental results show that the sliding distance and velocity are the major parameters influencing the wear rate in both the Al alloy and its composites. The presence of Mg2Si particles in the Al-Si matrix improved the wear resistance of the composites.
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Isachenko, G. N., V. K. Zaitsev, M. I. Fedorov, E. A. Gurieva, I. S. Eremin, P. P. Konstantinov, and M. V. Vedernikov. "The study of p-type material based on Sn-rich Mg2Si-Mg2Sn solid solution." In 2007 26th International Conference on Thermoelectrics (ICT 2007). IEEE, 2007. http://dx.doi.org/10.1109/ict.2007.4569471.

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GALKIN, K. N., and N. G. GALKIN. "INFLUENCE OF EMBEDDED LOW-DIMENSIONAL Mg2Si ON THE CONDUCTIVITY OF Si/Mg2Si/Si(111) HETEROSYSTEMS." In Proceedings of International Conference Nanomeeting – 2011. WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814343909_0035.

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GALKIN, K. N., and S. A. DOTSENKO. "SILICON OVERGROWTH ATOP LOW-DIMENSIONAL Mg2Si." In Proceedings of the International Conference on Nanomeeting 2009. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814280365_0021.

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Nakamura, Shigeyuki, Yoshihisa Mori, and Ken’ichi Takarabe. "Mg2Si thermoelectric device fabrication with reused-silicon." In International Conference and Summer School on Advanced Silicide Technology 2014. Japan Society of Applied Physics, 2015. http://dx.doi.org/10.7567/jjapcp.3.011202.

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Kaur, Kulwinder, Anita Rani, and Ranjan Kumar. "Thermoelectric properties of Al doped Mg2Si material." In ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2015): 4th National Conference on Advanced Materials and Radiation Physics. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4929239.

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GALKIN, N. G., K. N. GALKIN, and S. V. VAVANOVA. "HIGH DENSITY NANOSIZE Mg2Si CLUSTERS IN SILICON MATRIX." In Reviews and Short Notes to Nanomeeting-2005. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701947_0040.

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Fiameni, S., S. Boldrini, S. Battiston, F. Agresti, A. Famengo, S. Barison, and M. Fabrizio. "Synthesis and characterization of Bi-doped Mg2Si thermoelectric materials." In 9TH EUROPEAN CONFERENCE ON THERMOELECTRICS: ECT2011. AIP, 2012. http://dx.doi.org/10.1063/1.4731529.

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Battiston, S., S. Boldrini, S. Fiameni, F. Agresti, A. Famengo, M. Fabrizio, and S. Barison. "Nanostructured multilayered thin film barriers for Mg2Si thermoelectric materials." In 9TH EUROPEAN CONFERENCE ON THERMOELECTRICS: ECT2011. AIP, 2012. http://dx.doi.org/10.1063/1.4731534.

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Qian, Chen, Xie Quan, Zhao Feng-Juan, Cui Dong-Meng, and Li Xu-Zhen. "First-Principles Calculation of Electronic Structure of Mg2Si with Doping." In 2009 International Forum on Information Technology and Applications (IFITA). IEEE, 2009. http://dx.doi.org/10.1109/ifita.2009.22.

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