Relevant bibliographies by topics / Transition metal oxides. Thermal conductivity

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

Academic literature on the topic 'Transition metal oxides. Thermal conductivity'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Transition metal oxides. Thermal conductivity"

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Qiu, Xin, Bing Xie, Xue-mei Qing, Jiang Diao, Qing-yun Huang, and Shui-bo Wang. "Effects of Transition Metal Oxides on Thermal Conductivity of Mould Fluxes." Journal of Iron and Steel Research International 20, no. 11 (2013): 27–32. http://dx.doi.org/10.1016/s1006-706x(13)60192-2.

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Soheyli, Ehsan, and Mohammad Hossein Hekmat Shoar. "Investigation of thermal and electrical conductivity of phosphate glasses containing two transition metal oxides, lithium oxide and calcium oxide." Physica Scripta 89, no. 7 (2014): 075801. http://dx.doi.org/10.1088/0031-8949/89/7/075801.

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ALEXANDROV, A. S., and N. F. MOTT. "SPIN AND CHARGE BIPOLARON KINETICS OF HIGH-Tc SUPERCONDUCTORS." International Journal of Modern Physics B 08, no. 16 (1994): 2075–109. http://dx.doi.org/10.1142/s0217979294000865.

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We extend the BSC theory to the strong electron-phonon (magnon) coupling limit. We show that the formation of small polarons and bipolarons provides a number of new physical phenomena both in the normal and superconducting states and explains low-energy physics of high-Tc superconductors. Both lattice and spin (bi)polarons are discussed. A highly nonadiabatic motion of bipolarons leads to a unique physical nature of (bi)polaronic superconductivity, making it totally different from that of the BCS one, including its wellknown strong-coupling generalization. The maximum attainable Tc is estimated to be in the region of the transition from the Fermi-liquid to a charged Bose-liquid. Some evidence for 2e bosons is given from NMR, neutron scattering, near-infrared absorption, Hall effect, resistivity, thermal conductivity, and critical magnetic fields of high-Tc oxides. An infinite thermal conductivity of two-dimensional charged bosons is predicted below Tc. The insulator-metal transition and ARPES in copper oxides are also discussed. The proposed theory is not restricted by low dimensionality and might be applied to cubic oxides like BaPbBiO and to alkali-doped C 60.
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Katsufuji, Takuro, Tetsuji Okuda, Ryuichi Murata, Tatsuya Kanzaki, Kota Takayama, and Tomomasa Kajita. "Universal Behaviors of the Phonon Thermal Conductivity Associated with Charge/Orbital Ordering in Transition-Metal Oxides." Journal of the Physical Society of Japan 85, no. 1 (2016): 013703. http://dx.doi.org/10.7566/jpsj.85.013703.

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Krutskii, Yu L., N. Yu Cherkasova, T. S. Gudyma, O. V. Netskina, and T. M. Krutskaya. "Diborides of transition metals: Properties, application and production. Review. Part 1. Titanium and vanadium diborides." Izvestiya. Ferrous Metallurgy 64, no. 2 (2021): 149–64. http://dx.doi.org/10.17073/0368-0797-2021-2-149-164.

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The properties, applications and methods for producing titanium and vanadium diborides are considered. These diborides are oxygen-free refractory metal-like compounds. As a result, they are characterized by high values of thermal and electrical conductivity. Their hardness is relatively high. Titanium and vanadium diborides exhibit significant chemical resistance in aggressive environments. For these reasons, they have found application in modern technics. So, they are used as surfacing materials when applying wear-resistant coatings on steel products. It is also possible to use vanadium diboride as a catalyst in organic synthesis and the anode in renewable electrochemical current sources. Perspective are ceramics B4C – TiB2 and B4C – VB2 , which make it possible to obtain products based on boron carbide with high-quality performance characteristics, in particular, with increased crack resistance. Such composite ceramics are obtained by means of hot pressing, spark plasma sintering and pressureless sintering. The properties of refractory compounds depend on the content of impurities and dispersion. Therefore, to solve a specific problem associated with the use of refractory compounds, it is important to choose the method of their preparation correctly, to determine the admissible content of impurities in the starting components. This leads to the presence of different methods for the synthesis of borides. The main methods for their preparation are: synthesis from simple substances (metals and boron); borothermal reduction of oxides; carbothermal reduction (reduction of mixtures of metal oxides and boron with carbon; metallothermal reduction of mixtures of metal oxides and boron; carbide-boron reduction. Plasma-chemical synthesis (deposition from the vapor-gas phase) is also used to obtain diboride nanopowders. Each of these methods is characterized in the article.
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Krutskii, Yu L., T. S. Gudyma, K. D. Dyukova, R. I. Kuz’min, and T. M. Krutskaya. "Diborides of transition metals: Properties, application and production. review. Part 2. Chromium and zirconium diborides." Izvestiya. Ferrous Metallurgy 64, no. 6 (2021): 395–412. http://dx.doi.org/10.17073/0368-0797-2021-6-395-412.

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The second part of the review considers properties, application and methods for producing chromium and zirconium diborides. These diborides are oxygen-free refractory metal-like compounds. As a result, they are characterized by high values of thermal and electrical conductivity. Their hardness is relatively high. Chromium and zirconium diborides exhibit significant chemical resistance in aggressive environments. They have found application in modern technology because of these reasons. Chromium diboride is used as a sintering additive to improve the properties of ceramics based on boron carbide and titanium diboride. Zirconium diboride is a component of advanced ultra-high temperature ceramics (UHTC) ZrB2 –SiC used in supersonic aircrafts and in gas turbine assemblies. Ceramics B4C–CrB2 and B4C–ZrB2 have high-quality performance characteristics, in particular, increased crack resistance. The properties of refractory compounds depend on the content of impurities and dispersion. Therefore, to solve a specific problem associated with the use of refractory compounds, it is important to choose the method of their preparation correctly, to determine the admissible content of impurities in the starting components. This leads to the presence of different methods for the borides synthesis. The main methods for their preparation are: a) synthesis from elements; b) borothermal reduction of oxides; c) carbothermal reduction (reduction of mixtures of metal oxides and boron with carbon; d) metallothermal reduction of metal oxides and boron mixtures; e) boron-carbide reduction. Plasma-chemical synthesis (deposition from the vapor-gas phase) is also used to obtain diboride nanopowders. Each of these methods is described.
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Mohamed S. Teleb, Soha F. Mohammed, and Akmal S. Gaballa. "Syntheses and identification of cefotaxime-non-transition metal complexes." International Journal of Research in Pharmaceutical Sciences 12, no. 2 (2021): 1213–22. http://dx.doi.org/10.26452/ijrps.v12i2.4660.

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The coordination chemistry of the biologically active cefotaxime sodium and, in particular, the mode of its interaction with some metal ions of electronic configuration d0 (alkaline earth) and others, Zn(II), Pb(II), and Ce ions with the electronic configuration d10 has been investigated. Seven complexes were synthesized, isolated in the solid-state, and characterized by elemental analyses, conductivity measurements, IR and UV/VIS spectra, as well as thermal analyses. Based on the obtained experimental data and literature, the structural formulae to these complexes were suggested and formulated as [Mg(cef)2].2H2O (1), [Ca(cef)2].2H2O (2) [Sr(cef)2].2H2O (3), [Ba(cef)2].2H2O (4), [Zn(cef)2(H2O)2] (5), [Pb(cef)2(H2O)2].4H2O (6) and [Ce(cef)2(H2O)2].3H2O (7). The data obtained show that cefotaxime interacted with metal in a molar ratio of 2:1, respectively. Cefotaxime bonded to metal ions in the anionic form as a bidentate ligand through the lactam carbonyl (C=O) and the carboxylate group (COO-). Tetrahedral and octahedral shapes were proposed as the most likely geometries associated with a metal having such electronic configurations. The absorption bands observed in the electronic spectrum of free cefotaxime are also observed with some shifts in the spectra of its complexes, indicating their formation. The absorption bands of free cefotaxime and its complexes were assigned to electronic transitions. The thermal analyses date strongly support the structures proposed for the complexes and indicate the formation of the corresponding metal oxide as a final decomposition product.
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Mubarak, Suhail, Duraisami Dhamodharan, Manoj B. Kale, et al. "A Novel Approach to Enhance Mechanical and Thermal Properties of SLA 3D Printed Structure by Incorporation of Metal–Metal Oxide Nanoparticles." Nanomaterials 10, no. 2 (2020): 217. http://dx.doi.org/10.3390/nano10020217.

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Silver (Ag) ornamented TiO2 semiconducting nanoparticles were synthesized through the sol-gel process to be utilized as nanofillers with photo resin to enhance the mechanical and thermal properties of stereolithography 3D printed objects. The as-prepared Ag-TiO2 nanoparticles (Ag-TNP) were typified and qualified by XRD, XPS, Raman, and FESEM; TEM analysis dissected the morphologies. The enhancement in the tensile and flexural strengths of SLR/Ag-TNP nanocomposites was noted as 60.8% and 71.8%, respectively, at the loading content of 1.0% w/w Ag-TNP within the SLR (stereolithography resin) matrix. Similarly, the thermal conductivity and thermal stability were observed as higher for SLR/Ag-TNP nanocomposites, equated to neat SLR. The nanoindentation investigation shows an excerpt hike in reduced modulus and hardness by the inclusion of Ag-TNP. The resulted thermal analysis discloses that the introduction of Ag-TNP can appreciably augment the glass transition temperature (Tg), and residual char yield of SLR nanocomposites remarkably. Hence, the significant incorporation of as-prepared Ag-TNP can act as effective nanofillers to enhance the thermal and mechanical properties of photo resin.
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Berezina, O. Ya, N. P. Markova, E. N. Kolobova, et al. "Vanadium Oxide Nanofibers: Synthesis and Research on Functional Properties." Micro and Nanosystems 12, no. 1 (2020): 68–74. http://dx.doi.org/10.2174/1876402911666190806104117.

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Aim: Vanadium oxide nanofibers have been manufactured by the sol–gel electrospinning method followed by the thermal treatment in air and argon. Materials and Methods: The samples are characterized by optical, laser confocal and scanning electron microscopy, energy-dispersive X-ray elemental analysis, X-ray diffraction, cyclic voltammetry, and electrical conductivity measurements. Results: The obtained VO2 nanofibers demonstrate the semiconductor-to-metal phase transition. Also, the vanadium pentoxide nanofibers are examined as electrode materials for rechargeable Li-ion batteries.
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Pekker, Sandor, and Edward M. Eyring. "Measurement of Phase Transitions by Photothermal Radiometry: The Semiconductor-To-Metal Transition of Vanadium(IV) Oxide, VO2." Applied Spectroscopy 40, no. 3 (1986): 397–401. http://dx.doi.org/10.1366/0003702864509097.

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A new experimental method of investigating phase transitions of solids, photothermal radiometry, is described. The effects of modulation frequency, laser intensity, and heating-cooling rates on the first-order semiconductor-to-metal phase transition of a microcystalline vanadium dioxide sample have been studied. The PTR signal increases with temperature in both phases, and a negative peak occurs at the phase transition. The intensity of signal is inversely proportional to the square root of frequency at laser-beam chopping frequencies lower than 100 Hz, indicating that the sample is thermally thick, and the signal is controlled by the thermal conductivity and the heat capacity and is independent of the optical properties of the material. The relative peak intensity decreases slightly in the low-frequency range with increasing frequency and more sharply at higher frequencies. The measured temperature of the phase transition decreases linearly with the intensity of illuminating light, from which the static component of the temperature rise at the surface can be determined. From the increase of linewidth with the laser intensity one may estimate the amplitude of the temperature modulation at the surface. The measured temperature of the phase transition increases with increasing heating rate and decreases with increasing cooling rates. The effects of variable light intensity and heating-cooling rates can be eliminated by extrapolation, and the exact temperature of the phase transition is obtained.
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Dissertations / Theses on the topic "Transition metal oxides. Thermal conductivity"

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Beck, Michael Peter. "Thermal conductivity of metal oxide nanofluids." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26488.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Teja, Amyn S.; Committee Member: Abdel-Khalik, Said I.; Committee Member: Meredith, Carson; Committee Member: Nair, Sankar; Committee Member: Skandan, Ganesh. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Das, Supriyo. "Synthesis and structural, magnetic, thermal, and transport properties of several transition metal oxides and arsenides." [Ames, Iowa : Iowa State University], 2010. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3403075.

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Crowley, Kyle McKinley. "Electrical Characterization, Transport, and Doping Effects in Two-Dimensional Transition Metal Oxides." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1597327584506971.

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Gunatilleke, Wilarachchige D. C. B. "Analysis and New Applications of Metal Organic Frameworks (MOF): Thermal Conductivity of a Perovskite-type MOF and Incorporation of a Lewis Pair into a MOF." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7514.

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Metal organic frameworks have gained much attention due to their tunable pore sizes and very high surface areas. With the discovery many of these type materials the need has raised to look into new applications of theses porous frameworks. This thesis focuses on the synthesis of a new perovskite-type metal organic framework and measurement of its thermal conductivity in search of its applicability as a thermoelectric material. The second part of this work focuses on the synthesis of a metal organic framework incorporated with a Lewis pair for the first time. The optimum loading amount of the Lewis pair into the framework was also investigated.
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Al-Sousi, Ghareeb N. "Studies on the thermal decomposition behaviour, kinetics and electrical conductivity of the non-isothermal decomposition of pyridine mono carboxylic acids and some of their transition metal complexes." Thesis, Aston University, 2000. http://publications.aston.ac.uk/9623/.

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The thesis is divided into four chapters. They are: introduction, experimental, results and discussion about the free ligands and results and discussion about the complexes. The First Chapter, the introductory chapter, is a general introduction to the study of solid state reactions. The Second Chapter is devoted to the materials and experimental methods that have been used for carrying out the experiments. The Third Chapter is concerned with the characterisations of free ligands (Picolinic acid, nicotinic acid, and isonicotinic acid) by using elemental analysis, IR spectra, X-ray diffraction, and mass spectra. Additionally, the thermal behaviour of free ligands in air has been studied by means of thermogravimetry (TG), derivative thermogravimetry (DTG), and differential scanning calorimetry (DSC) measurements. The behaviour of thermal decomposition of the three free ligands was not identical Finally, a computer program has been used for kinetic evaluation of non-isothermal differential scanning calorimetry data according to a composite and single heating rate methods in comparison with the methods due to Ozawa and Kissinger methods. The most probable reaction mechanism for the free ligands was the Avrami-Erofeev equation (A) that described the solid-state nucleation-growth mechanism. The activation parameters of the decomposition reaction for free ligands were calculated and the results of different methods of data analysis were compared and discussed. The Fourth Chapter, the final chapter, deals with the preparation of cobalt, nickel, and copper with mono-pyridine carboxylic acids in aqueous solution. The prepared complexes have been characterised by analyses, IR spectra, X-ray diffraction, magnetic moments, and electronic spectra. The stoichiometry of these compounds was ML2x(H20), (where M = metal ion, L = organic ligand and x = water molecule). The environments of cobalt, nickel, and copper nicotinates and the environments of cobalt and nickel picolinates were octahedral, whereas the environment of copper picolinate [Cu(PA)2] was tetragonal. However, the environments of cobalt, nickel, and copper isonicotinates were polymeric octahedral structures. The morphological changes that occurred throughout the decomposition were followed by SEM observation. TG, DTG, and DSC measurements have studied the thermal behaviour of the prepared complexes in air. During the degradation processes of the hydrated complexes, the crystallisation water molecules were lost in one or two steps. This was also followed by loss of organic ligands and the metal oxides remained. Comparison between the DTG temperatures of the first and second steps of the dehydration suggested that the water of crystallisation was more strongly bonded with anion in Ni(II) complexes than in the complexes of Co(II) and Cu(II). The intermediate products of decomposition were not identified. The most probable reaction mechanism for the prepared complexes was also Avrami-Erofeev equation (A) characteristic of solid-state nucleation-growth mechanism. The tempemture dependence of conductivity using direct current was determined for cobalt, nickel, Cl.nd copper isonicotinates. An activation energy (ΔΕ), the activation energy (ΔΕ ) were calculated. The temperature and frequency dependence of conductivity, the frequency dependence of dielectric constant, and the dielectric loss for nickel isonicotinate were determined by using altemating current. The value of s parameter and the value of density of state [N(Ef)] were calculated.
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Tourinho, Francisco. "Ferrofluides a base de ferrite de cobalt et de ferrite de manganese : elaboration, comportement physicochimique et magnetique." Paris 6, 1988. http://www.theses.fr/1988PA066570.

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Silva, Adélia Maria Lima da. "Análise térmica aplicada à síntese e caraterização de óxidos mistos de níquel e terras raras." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-26082014-154405/.

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Este trabalho apresenta um estudo sistemático sobre síntese, caracterização e análise térmica aplicada a óxidos mistos dos tipos TR2NiO4 [TR = La, Eu e Y (III)] e TRNiO3 [TR = Pr, Nd e Sm (III)]. Os primeiros óxidos foram obtidos a partir da decomposição térmica de acetatos de terras raras e níquel utilizando-se três métodos distintos: (1) mistura mecânica; (2) evaporação do solvente e (3) cristalização com acetona. Os acetatos simples e binários foram caracterizados por análise elementar, espectroscopia de absorção na região do infravermelho, difração de raios X, TG/DTG, DSC e DTA. Os resultados revelaram a formação de sais binários quando utilizaram-se os métodos 2 e/ou 3. Os produtos da decomposição térmica foram basicamente os óxidos individuais e após tratamento térmico obteveram-se os óxidos desejados. Os óxidos TRNiO3 foram preparados através de três métodos diferentes: (1) mistura de óxidos; (2) precipitação simultânea de hidróxidos e (3) processo sol-gel. Estas amostras foram sinterizadas em temperaturas 650 &#8804; T &#8804; 1000°C e sob pressões de até 70 atm de O2, caracterizadas por difração de raios X, resistividade elétrica, microscopia eletrônica de varredura e calorimetria exploratória diferencial. Os resultados indicaram que o método sol-gel produziu óxidos monofásicos. Os outros dois métodos, mistura de óxidos e hidróxidos, produziram a fase desejada e traços dos óxidos individuais. Desta forma, concluiu-se que a escolha do método a ser utilizado é fundamental para a obtenção do óxido misto desejado.<br>This work reports a systematic study on the synthesis, characterization and thermal analysis applied of mixed oxides type-TR2NiO4 [TR = La, Eu e Y (III)] e typeTRNiO3 [TR = Pr, Nd e Sm (III)]. The first oxides were prepared through thermal decomposition of rare earth and nickel acetates, which were synthesized by three methods: (1) mechanical mixture; (2) solvent evaporation and (3) crystallization with addition of acetone. The simply and binary acetates were characterized by elementare analyses, infrared spectroscopy, X ray diffraction, TG/DTG, DSC and DTA. The results revealed formation of binary salts when was used the second and/or third methods. The products of thermal decomposition were single oxides, but after thermal treatment were obtained the single phase of materials. The last oxides were prepared through three different methods: (1) mixture of oxides; (2) simultaneous precipitation of hydroxides and (3) sol-gel process. Samples were sintered at temperatures between 650 &#8804; T &#8804; 1000°C and under oxygen pressures until 70 atm, characterized by X ray diffraction, electrical resistivity, scanning electron microscopy and differential scanning calorimetry. The results revealed that the sol-gel method produced single phase oxides. The other two methods, mixture of oxides and hydroxides, led to have this phase with traces of single oxides. Therefore, it was concluded that the method used is fundamental to get the desired mixed oxides.
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Messaadi, Saci. "Modélisation électrique de couches ou de fils minces métalliques : Effet thermique d'interface verre-couche amorphe." Nancy 1, 1987. http://www.theses.fr/1987NAN10048.

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En utilisant l'expression de la conductivité électrique donnant l'équivalence entre le modèle de Fuchs-Sondheimer et le modèle de Cottey étendu, des expressions simples de la conductivité sont substituées à celle du modèle de Mayadas-Shatzkcs. De nouvelles formulations simplifiées relatives à la conductivité électrique des doubles couches métalliques, des fils fins métalliques en l'absence de champ magnétique et la magnétorésistance longitudinale de ces derniers sont obtenues dans le cadre du modèle de conduction multidimensionnel
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Bekka, Ahmed. "Etude cristallographique et magnétique de nouveaux ferrites de type [béta]" [A(y)B(n+)((1-y)/n)] (1+x) Zn (x) Fe(11-x) O17 (x [à peu près égal à] 0,9) avec A,B = Li, Na, K, Ag, Ca, Sr, Ba, Pb." Grenoble 1, 1986. http://www.theses.fr/1986GRE10138.

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Preparation sous forme de monocristaux et de polycristaux de na::(4,2) k::(1,8) fe::(30) me::(3) o::(51) (me = zn, mg, cu). Determination de la structure cristalline, et mesures de conductivite ionique, d'aimantation, determination des temperatures de curie et des constantes d'anisotropie magnetocristalline. Substitution partielle des cations na et k par li, na, k, ag, ca, sr, ba, pb. Caracterisation par diffraction rx, microscopie a balayage et a transmission
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Faulmann, Christophe. "Conducteurs derives de metaux de transition : complexes moleculaires, polymeres, oxydes de cuivre." Toulouse 3, 1988. http://www.theses.fr/1988TOU30160.

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Book chapters on the topic "Transition metal oxides. Thermal conductivity"

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Williams, Wendell S. "Thermal Conductivity of Transition Metal Carbides." In The Physics and Chemistry of Carbides, Nitrides and Borides. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2101-6_35.

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Parangi, Tarun, and Manish Kumar Mishra. "Titanium Dioxide as Energy Storage Material: A Review on Recent Advancement." In Titanium Dioxide [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99254.

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With the increased attention on sustainable energy, a novel interest has been generated towards construction of energy storage materials and energy conversion devices at minimum environmental impact. Apart from the various potential applications of titanium dioxide (TiO2), a variety of TiO2 nanostructure (nanoparticles, nanorods, nanoneedles, nanowires, and nanotubes) are being studied as a promising materials in durable active battery materials. The specific features such as high safety, low cost, thermal and chemical stability, and moderate capacity of TiO2 nanomaterial made itself as a most interesting candidate for fulfilling the current demand and understanding the related challenges towards the preparation of effective energy storage system. Many more synthetic approaches have been adapted to design different nanostructures for improving the electronic conductivity of TiO2 by combining with other materials such as carbonaceous materials, conducting polymers, metal oxides etc. The combination can be done through incorporating and doping methods to synthesize TiO2-based anodic materials having more open channels and active sites for lithium and/or sodium ion transportation. The present chapter contained a broad literature and discussion on the synthetic approaches for TiO2-based anodic materials for enhancing the lithium ion batteries (LIBs) and sodium ion batteries (SIBs) performance. Based on lithium storage mechanism and role of anodic material, we could conclude on future exploitation development of titania and titania based materials as energy storage materials.
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Conference papers on the topic "Transition metal oxides. Thermal conductivity"

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Bhatt, Pramod, Anupama Upadhyay, Ranu Bhatt, and S. M. Yusuf. "Transition metal oxides/poly(vinylidenefluoride) nanocomposites films with improved thermal properties." In DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113406.

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Merchan-Merchan, W., A. V. Saveliev, and Aaron Taylor. "Flame Synthesis of Nanostructured Transition Metal Oxides." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68987.

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Various transition metal oxide nanostructures are synthesized using a novel probe-flame interaction method. An opposed flow flame of methane and oxygen enriched air provides a high-temperature reacting environment forming various metal oxide structures directly on the surface of pure metal probes. The unique thermal profile and chemical composition of the generated flame tends to convert almost pure bulk (99.9%) metallic materials into 1-D and 3-D structures of different chemical compositions and unique morphologies. The synthesized molybdenum, tungsten, and iron oxide structures exhibit unique morphological characteristics. The application of Mo probes results in the formation of micron size hollow and non-hollow Mo-oxide channels and elongated structures with cylindrical shapes. The use of W probes results in the synthesis of 1-D carbon-oxide nanowires, 3-D structures with rectangular shapes, and thin oxide plates with large surface areas. The formation of elongated iron-oxide nanorods is observed on iron probes. The iron nanorods’ diameters range from ten nanometers to one hundred nanometers with lengths of a few micrometers. Flame position, probe diameter, and flame exposure time tend to play an important role for material shape and selectivity.
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Huang, Xiao. "Reducing Thermal Conductivity of Ceramic Materials Through Alloying." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82116.

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For gas turbines and advanced nuclear power reactors, ceramic materials are used to provide thermal insulation to metallic components. Reducing the thermal conductivity of these ceramic materials allows further decrease in either metal surface temperature or thickness of the insulating materials. In this paper, our past research on the effects of oxide dopants is summarized with a focus on thermal properties. Metal oxides of different valence, ionic radius, and mass were incorporated into yttria partially stabilized zirconia (7 wt% Y2O3-ZrO2) using mechanical alloying process. The powder blends were consolidated using sintering and plasma spraying. The oxides investigated included trivalent Yb2O3, Sc2O3 and Cr2O3, tetravalent CeO2 and TiO2, and pentavalent Nb2O5 and Ta2O5. While all oxides provided improvement to thermal conductivity reduction, the most significant effect on reducing the thermal conductivity of 7YSZ was found by using trivalent oxides. Furthermore, the effect of dopant was also heavily influenced by the molar percentage of dopants.
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Huang, Xiao. "Effect of Co-Doping on Microstructure, Thermal and Mechanical Properties of Ternary Zirconia-Based Thermal Barrier Coating Materials." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59007.

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7YSZ (yttria stabilized zirconia) was co-doped with metal oxides of different valence, ionic radius and mass in order to investigate microstructural and property changes as a result of co-doping. Mechanical alloying process was used to produce the powder blends which were subsequently sintered at 1500°C for 120 hours. The results from SEM, XRD and DSC showed that the microstructures of the co-doped ternary oxides were affected by the amount of oxygen vacancies in the system, the co-dopant cation radius and mass. Increasing the number of oxygen vacancies by the addition of trivalent co-dopant (Yb2O3 and Sc2O3) as well as the use of larger cations promoted the stabilization of cubic phase. The tetravalent co-dopant (CeO2), on the other hand, had the effect of stabilizing tetragonal phase which may transform into monoclinic phase during cooling, depending on the concentration of tetravalent co-dopant and the mass. Smaller cation mass had the effect of reducing the transformation temperature from tetragonal to monoclinic phase. Pentavalent co-dopants (Nb2O5 and Ta2O5) were found to stabilize the tetragonal phase at high temperature; however, the stability of the tetragonal phase upon cooling was determined by the mass and ionic radius of the co-dopants. Cation clustering was observed during cooling in trivalent oxide co-doped 7YSZ while clustering of trivalent and pentavalent cations in pentavalent co-doped 7YSZ was not detected. Additionally, from the thermal conductivity measurement results, it was found that trivalent oxides exhibited the most significant effect on reducing the thermal conductivity of ternary oxides; this trend was followed by pentavalent co-doping oxides whereas the tetravalent CeO2 co-doped 7YSZ showed marginal effect. A semi-empirical thermal conductivity model was established based on defect cluster model and the predicted room temperature thermal conductivity values were found to be consistent with that measured experimentally. Furthermore, the incorporation of co-dopant oxide in 7YSZ was observed to substantially modify the elastic modulus of the ternary oxides. More specifically, the addition of co-dopant with larger cation radius was found to reduce the elastic modulus of 7YSZ due to the increase in lattice parameter(s).
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5

Chang, Ruxia, Desong Fan, and Qiang Li. "Research on Thermal Properties of Insulator-Metal Transition at Room Temperature in Sm1-xCaxMnO3." In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-3963.

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Abstract The high-purity electron-doped manganites Sm1-xCaxMnO3 nanopowder were prepared by the solid-state reaction method, then the bulk material were obtained through granulation, molding, calcining, grinding and polishing. SCMO nanoparticles with 200 nm were obtained by the sol-gal process. The phase and surface morphology of these materials were characterized by X-ray diffraction and Scanning electron microscope and other experiments. The variable resistivity of the bulk materials were measured by two-wire method in the temperature range of 100–420K. The thermal conductivity was measured by the Laser Flash method. The results show that different doping ratios can change the phase transition temperature of the metal-insulation state. The temperature changed from 0 to 50 °C. The TMI could be regulated to room temperature. When the temperature is high than the TMI, it performs as metal state, on the contrary, it performs as an insulating state.
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6

Nikapitiya, N. Y. Jagath B., and Hyejin Moon. "Thermal Conductivity Enhancement of Room Temperature Ionic Liquids (RTILs) With Various Magnetic Nanoparticles." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75118.

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This paper reports an experimental study of thermal conductivity of room temperature ionic liquids (RTILs) based magnetic nanofluids. Various magnetic nanoparticles of metal oxides with high thermal conductivity, such as CuO, Al2O3, Fe3O4 and Carbon Nano Tubes (CNTs), were used to prepare magnetic nanofluids, while RTIL, trihexyl (tetradecyl) posphonium dicyanamide was used as the base fluid. Two major parameters that affect to the thermal conductivity enhancement of fluids were investigated. The effect of particle concentration and external magnetic fields were tested. It was observed that the magnetic nanofluids thermal conductivities increase with increment of particle concentration and external magnetic field parallel to the temperature gradient. Besides, it was observed that under higher magnetic fields, thermal conductivity enhancement tends to approach a saturation state. Surfactant was used to disperse magnetic nanoparticles within the RTILs. The transient hot wire method was used for this investigation.
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Tian, Y., and C. Y. Zhao. "Thermal Analysis in Phase Change Materials (PCMs) Embedded With Metal Foams." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22452.

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The heat transfer enhancement for phase change materials (PCMs) has received increasing attention nowadays, since most of PCMs have low thermal conductivities which prolong the charging and discharging processes. Metal foams, as a sort of novel material with high thermal conductivity, are believed to be a promising solution to enhance the heat transfer performance of PCMs for thermal energy storage systems. The effects of natural convection on heat transfer enhancement for PCMs embedded with metal foams are investigated in this paper. The numerical investigation is based on the two-equation non-equilibrium heat transfer model, where the coupled heat conduction and natural convection in PCMs are considered at phase transition and liquid zones. The numerical results are validated by experimental data. In order to investigate the effect of metal foams on heat transfer, two different cases are compared in this study, which are the Case A (PCMs embedded with metal foams) and the Case B (pure PCMs). At the solid zone, heat conduction plays a dominant part because of natural convection’s absence, thus metal foams achieve much higher heat conduction rate than pure PCMs, and this can be attributed to the high thermal conductivity of metal foams skeleton and the heat can be quickly transferred through the foam solid structure to the whole domain of PCMs. At the two-phase zone and liquid zone, natural convection takes place and becomes the dominant heat transfer mode, but metal foam structures suppress the natural convection inside the PCMs owing to big flow resistance in metal foams. In spite of this suppression caused by metal foams, the overall heat transfer performance of Case A is still superior to the counterpart of Case B (pure PCMs), implying the enhancement of heat conduction offsets or exceeds the natural convection loss. The results show that the heat transfer enhancement due to the natural convection in PCMs embedded with metal foams is not as strong as expected, since metal foams have big flow resistance and the natural convection is suppressed. It also shows that better heat transfer performance can be achieved by using the metal foams of smaller porosity and bigger pore density. Last but not least, a series of detailed velocity and temperature profiles are given through numerical solutions, in order to present a vivid evolution of flow field and temperature profiles in the whole melting process.
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8

Su, Che-Fu, Xinrui Xiang, Hamed Esmaeilzadeh, et al. "A New Composite Phase Change Material for Thermal Energy Storage." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10457.

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Abstract Enhancing the thermal conductivity of phase change materials (PCMs) is attracting attention for renewable energy applications such as solar, geothermal and wind energy. The use of energy storage can significantly improve the efficiency of renewable energy systems due to their intermittent nature. Latent heat thermal energy storage is a particularly attractive technique due to its high capacity can store energy at near constant temperature corresponding to the phase transition temperature of the PCMs. The present work aims to overcome this undesirable property of low thermal conductivity by manipulating metal fillers including nickel (Ni) nanoparticles/nanowires within the paraffin wax to improve its thermal property. In present work, a finite element method (FEM) was developed to obtain a fundamental understanding of the behavior of the Ni particles/wires under a uniform magnetic field by predefined magnetic pads. In the model, the Navier-Stokes equations were introduced as governing equations for the fluid field and the magnetic field was simulated by Maxwell’s equations. Then the motion of single Ni wire was modeled and the translation and rotational movements of the wire was studied in this paper.
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Narayanan, V., X. Lu, and S. Hanagud. "Shock-Induced Chemical Reactions in Multi-Functional Structural Energetic Intermetallic Nanocomposite Mixtures." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81636.

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Shock induced chemical reactions of intermetallics or mixtures of metal and metal-oxides are also used to synthesize new materials with unique phases and microstructures. These materials are also of significant interest to the energetics community because of the significant amount of heat energy released during chemical reactions when subjected to shock and/or thermal loading. Binary energetic materials are classified into two categories— metal/metal oxides and intermetallics. When these materials are synthesized at a nano level with binders and other structural reinforcements, the strength of the resulting mixture increases. Thus, these materials can be used as dual-functional binary energetic structural materials. In this paper, we study the shock-induced chemical reactions of intermetallic mixtures of nickel and aluminum of varying volume fractions of the constituents. The chemical reaction between nickel and aluminum produces different products based on the volume fraction of the starting nickel and aluminum. These chemical reactions along with the transition state are modeled at the continuum level. In this paper, the intermetallic mixture is impact loaded and the subsequent shock process and associated irreversible processes such as void collapse and chemical reactions are modeled in the framework of non-equilibrium thermodynamics. Extended irreversible thermodynamics (EIT) is used to describe the fluxes in this system and account for the associated irreversible processes. Numerical simulations of the intermetallic mixture are carried out using finite difference schemes.
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Vahedi, Nasser, and Alparslan Oztekin. "Experimental Analysis of Kinetics and Cyclic Performance of Cobalt Oxide Powder As Redox Reactant Agent for High-Temperature Thermochemical Energy Storage." In ASME 2019 Heat Transfer Summer Conference collocated with the ASME 2019 13th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ht2019-3681.

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Abstract For continuous operation of Concentrated Solar Power (CSP) Plants it is necessary to integrate thermal energy storage module. High-density energy storage system at a high temperature is required for the new generation of large scale CSP plants. The Thermochemical Energy Storage (TCES) systems use the enthalpy of formation of a reversible chemical reaction for energy storage and release. Gas/solid reduction-oxidation (redox) reactions of solid metal oxides using air as heat transfer fluid (HTF) can be directly integrated with air operated CSP plants, and there is no need for HTF storage and any intermediate heat exchanger. A new generation of large scale CSP plants uses high-temperature solar collectors to increase power cycle efficiency. Such operating conditions require the development of suitable high-temperature TCES systems. The selection of suitable metal oxide reactant is very critical in the design of such high-temperature storage systems and requires a detailed study of the physics of reaction within the reactor. Cobalt oxide (Co3O4/CoO) has been verified to have a high reaction temperature, high enthalpy of reaction together with reasonable cyclic and thermal stability. Unique features of cobalt oxide require more fundamental study of the physics behind the redox reaction and its cyclic performance. Study of the physics of materials during the storage/release cycle is necessary for the design and improvement of the reactor and can be used as a benchmark for comparison of any implemented changes. A high precision, true differential TGA/DSC instrument is used for simultaneous measurement of weightchange (TGA) and true differential heat flow (DSC) for pure cobalt oxide (Co3O4) powder. Storage cycle (charge/discharge) was conducted for five cycles. Complete re-oxidation was achieved within reasonable times by performing the two reactions at close temperatures and controlling heating/cooling rates. Basic performance parameters were derived as a benchmark for future references. Single-cycle controlling parameters such as heating/cooling rate, dwelling time, and purge gas rate were investigated. System response for few initial cycles was studied. It was shown that pure cobalt oxide could regain weight and complete re-oxidation with reasonable stability. A transition for heat flow was detected after a few initial cycles which reduced discharge heat and decreased overall performance.
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Reports on the topic "Transition metal oxides. Thermal conductivity"

1

Bondi, Robert, Michael Desjarlais, Aidan Thompson, Geoffrey Brennecka, and Matthew Marinella. Electrical conductivity in oxygen-deficient phases of transition metal oxides from first-principles calculations. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1096251.

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2

Sarachik, Myriam P. Thermal Conductivity and Thermopower near the 2D Metal-Insulator transition, Final Technical Report. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1170416.

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3

Das, Supriyo. Synthesis and structural, magnetic, thermal, and transport properties of several transition metal oxides and aresnides. Office of Scientific and Technical Information (OSTI), 2010. http://dx.doi.org/10.2172/985308.

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