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Dissertations / Theses on the topic 'Grain boundary electron scattering'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Синашенко, Оксана Володимирівна, Оксана Владимировна Синашенко, Oksana Volodymyrivna Synashenko, et al. "The Influence of Electrons Scattering at Grain Boundary and at Surface on Resistivity and Thermal Coefficient of Resistance of Nanocrystalline Silver Films." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34900.

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The paper describes the method of separation of the share of both surface and grain boundary electron scattering on resistance and thermal coefficient of resistance (TCR). The calculation of ρd, βd and gb, βgb values, which correspond to the surface and grain boundary electron scattering respectively, and their comparative analysis were done based on experimental data of thermal and size dependence of specific resistance (ρ) and TCR (β) for nanocrystalline silver films. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34900

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2

Hansen, Landon Thomas. "Characterization of Dislocation - Grain Boundary Interactions Through Electron Backscatter Diffraction." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7536.

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Further understanding of dislocation-GB interactions is critical to increasing the performance of polycrystalline metals. The research contained within this dissertation aims to further dislocation-GB interaction understanding through three research studies. First, the effect of noise in EBSPs on GND calculations was evaluated in order to improve dislocation characterization via HR-EBSD. Second, the evolution of GNDs and their effects on back stress was studied through experimental and computational methods applied to tantalum oligo specimens. Third, statistical analysis was used to evaluate g

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3

Amalaraj, Akash Savio. "5D Grain Boundary Characterization from EBSD Microscopy." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/8816.

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Knowledge of the full 5-degree Grain Boundary Character Distribution (GBCD) is vital to understanding properties, such as gas diffusivity, that are dominated by grain boundary character. Surface characterization techniques, such as Electron Backscattered diffraction (EBSD), can provide only 4 of the 5 GB characteristics (the rotation between the neighboring grains, and the trace of the GB on the surface). The inclination of the GB in the direction normal to the surface is not known. A previous study indicated that the GB inclination could be recovered by correlating the Electron Backscattered

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4

Dudeck, K. J. "High resolution electron microscopy investigation of the strontium titanate 3(112) [110] grain boundary." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510948.

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5

Sun, Tik. "Classical Size Effect in Copper Thin Films: Impact of Surface and Grain Boundary Scattering on Resistivity." Doctoral diss., Orlando, Fla. : University of Central Florida, 2009. http://purl.fcla.edu/fcla/etd/CFE0002959.

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6

Wade, C. Austin. "Investigation of Grain Boundary Segregation and Embrittlement Mechanisms of the Cu-Bi System by Analytical Electron Microscopy." Thesis, Lehigh University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3723911.

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<p> Grain boundary (GB) segregation and embrittlement of copper (Cu) by small amounts of bismuth (Bi) has been investigated on 6°, 13°, and 33° Cu twist bicrystals. The results from micro-mechanical double edge notched testing showed no embrittlement effects in the 6° GB. The 33° GB has been shown to be significantly embrittled by the introduction of Bi. Single edge notch testing of the 13° GB also showed a reduction in fracture toughness. These mechanical results have been interpreted through the use of analytical electron microscopy (AEM) studying the GB geometry, the

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7

Basinger, John A. "Detail Extraction from Electron Backscatter Diffraction Patterns." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2689.

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Cross-correlation based analysis of electron backscatter diffraction (EBSD) patterns and the use of simulated reference patterns has opened up entirely new avenues of insight into local lattice properties within EBSD scans. The benefits of accessing new levels of orientation resolution and multiple types of previously inaccessible data measures are accompanied with new challenges in characterizing microscope geometry and other error previously ignored in EBSD systems. The foremost of these challenges, when using simulated patterns in high resolution EBSD (HR-EBSD), is the determination of patt

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8

Pourmatin, Hossein. "Computational Multiscale Methods for Defects: 1. Line Defects in Liquid Crystals; 2. Electron Scattering in Defected Crystals." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/458.

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In the first part of this thesis, we demonstrate theory and computations for finite-energy line defect solutions in an improvement of Ericksen-Leslie liquid crystal theory. Planar director fields are considered in two and three space dimensions, and we demonstrate straight as well as loop disclination solutions. The possibility of static balance of forces in the presence of a disclination and in the absence of ow and body forces is discussed. The work exploits an implicit conceptual connection between the Weingarten-Volterra characterization of possible jumps in certain potential fields and th

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9

Dohr, Judith. "Micromechanical testing of oxidized grain boundaries." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:fb8a08ef-87d8-47ab-9ac8-89bf300203ea.

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Primary water stress corrosion cracking (SCC) of metals in pressurized water reactors (PWRs) is known to be one of the most challenging and cost intensive modes of failure in the nuclear industry. Even though it is known that cracking in Ni-base alloys proceeds mainly intergranular (IG), the initiation and propagation of cracks in ductile metals are not yet understood and a much-desired accurate prediction of SCC related failure seems unobtainable. In this thesis, a combination of microcantilever fracture experiments, scanning electron- (SEM) and transmission electron microscopy (TEM) techniqu

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10

Crane, Samantha. "High resolution transmission electron microscopy analysis of the influence of grain boundary and triple grain junction crystallinity and chemistry on silicon carbide-based armor with small additions of aluminum, boron, and carbon." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010845.

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11

Li, Siqian. "The atomic struture of inversion domains and grain boundaries in wurtzite semonconductors : an investigation by atomistic modelling and high resolution transmission electron microscopy." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC252/document.

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Au cours de ce travail, nous avons étudié deux types de défauts interfaciaux: domaines d’inversion (DI) et joints de grains (JG) dans des semiconducteurs de structure wurtzite (nitrures- d’éléments III, ZnO et l’hétérostructure ZnO/GaN) en utilisant le MET haute résolution et la modélisation ab initio. Dans le cas des DI, nos analyses théoriques montrent qu'une configuration tête-à-tête avec une séquence d'empilement à l’interface AaBbAa-AcCaA (H4) est la structure la plus stable dans les composés binaires (nitrures et ZnO wurtzites). De plus, un gaz d’électrons (2DEG) ou de trous (2DHG) à 2 d

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12

Philipp, Martin. "Electrical Transport and Scattering Mechanisms in Thin Silver Films for Thermally Insulating Glazing." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-70920.

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Thin silver films are widely used in low-emissivity coatings for building glazing due to their high reflectance in the infrared and high transmittance in the visible spectrum. The determining parameter for the infrared reflectance is the electrical conductance of the layer stack - the better the conductance the higher the reflectance. Electrically conductive films of thicknesses smaller than the electron mean free path exhibit a strong increase in the residual resistivity proportional to the inverse of the film thickness. Despite intensive discussions, which have extended over tens of years, i

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13

Bres, Etienne. "Etude des cristaux de l'email dentaire humain par microscopie electronique a resolution proche atomique." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13166.

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14

Kajbaji, Mohamed El. "Etude du joint de grain [SIGMA] = 9 dans le silicium parfait, déformé et recuit par microscopie électronique à haute résolution." Grenoble 1, 1986. http://www.theses.fr/1986GRE10102.

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Etude des mecanismes d'interaction joint de grain dislocations lors de la deformation du bicristal, mettant en evidence la dissociation des dislocations entrant dans le joint, leur perte d'identite et l'interaction entre eux des residus. Determination des structures des dislocations residuelles. Apparition de precipites lors du recuit du bicristal deforme

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15

Rouvière, Jean-Luc. "Structure atomique des joints de grains de flexion d'axe <001> dans le silicium et le germanium." Grenoble 1, 1989. http://www.theses.fr/1989GRE10010.

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Etude de cinq joints de grains de flexion d'axe 001, de grande coincidence (sigma=5, 65, 13, 25 et 41) par microscopie electronique haute resolution et relaxation numerique. Presentation d'une analyse en termes d'unites structurales-dislocation

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16

Ihlal, Ahmed. "Analyses quantitatives par sem/ebic des defauts recombinants dans les semiconducteurs polycristallins : influence des traitements thermiques sur l'activite electrique des bicristaux de silicium." Caen, 1988. http://www.theses.fr/1988CAEN2007.

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Etude quantitative , par la methode ebic, de la recombinaison des porteurs minoritaires dans des bicristaux de silicium en fonction des traitements thermiques, entre 450 et 950**(o)c. Un developpement des phenomenes physiques regissant la creation de differentes theories conduisant au traitement quantitatif du signal ebic est presente. Selon le traitement thermique, le contraste des deux types de joints de grains evolue avec la temperature: vitese de recombinaison et longueur de diffusion varient avec la temperature de recuit

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17

Kergavarat, Jean-François. "Influence de la microstructure sur la sensibilité à la corrosion sous contrainte des alliages 600 et 690 en milieu primaire des réacteurs à eau sous pression." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0012.

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Les mecanismes elementaires de la fissuration par csc pour le couple alliage 600 milieu primaire ne sont pas connus. Experimentalement, il existe des similitudes entre cet endommagement et la rupture a chaud par fluage des aciers inoxydables austenitiques. Dans le cadre de la rupture a chaud il a ete demontre que le glissement intergranulaire (gi), mouvement relatif d'un grain par rapport a son voisin, joue un role preponderant dans la ruine des materiaux. L'objectif de notre etude est de verifier si ce mecanisme de deformation intervient lors de la fissuration par csc. Notre travail prend en

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18

Ismail, Abir. "Etude de la diffusion du Dy dans les aimants polycristallins frittés Nd2Fe14B par microscopie électronique." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALY093.

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Les aimants permanents frittés type NdFeB contenant du dysprosium (Dy) sont des éléments clés pour la transition vers des transports décarbonés et le déploiement massif des véhicules électriques. Or, le Dy est identifié comme un élément critique par l’Union Européenne à cause du monopole chinois entrainant un risque d’approvisionnement. Pour faire face à cette vulnérabilité d’approvisionnement, une technique de diffusion aux joints de grains connue sous le terme anglais Grain Boundary Diffusion Process (GBDP) a été développée. Cette méthode cherche à minimiser la quantité du Dy utilisé dans ce

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19

Dulong, Jean-Luc. "Etude de la fonction diélectrique infrarouge de métaux nobles à haute température, par réflectométrie différentielle." Paris 6, 1986. http://www.theses.fr/1986PA066397.

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Conception et mise au point d'un appareil permettant de mesurer la différence de réflectivité entre un échantillon chauffé jusqu'à 600°C et un échantillon à température ambiante dans un domaine spectral allant de 1,5 à 10 microns. Etude des interactions électron-phonon et électron-électron dans l'argent et le cuivre à partir de leurs propriétés optiques dans l'infrarouge. Influence des défauts de volume et de surface. Détermination de l'indice complexe de couches minces peu absorbantes, dans l'infrarouge.

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20

Lopez, Gerald Gabriel. "The impact of interconnect process variations and size effects for gigascale integration." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31781.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Jeffrey A. Davis; Committee Co-Chair: James D. Meindl; Committee Member: Azad J. Naeemi; Committee Member: Dennis W. Hess; Committee Member: George F. Riley; Committee Member: Linda S. Milor. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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21

Hamet, Jean-François. "Etude de bicristaux de silicium par spectroscopie capacitive, influence des traitementsthermiques et des impuretes." Caen, 1989. http://www.theses.fr/1989CAEN2001.

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Etude des proprietes electriques des joints de grain par dlts, tscap et egalement par des mesures de recombinaison ebic. L'activite electrique des joints est liee a la presence de precipites a caractere metallique le long des joints

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22

Barrès, Quentin. "Effet de la structure des joints de grains sur le phénomène de ségrégation induite par irradiation aux ions lourds dans un alliage Fe-13Cr." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR072.

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Les aciers Ferritiques/Martensitiques (F/M) ainsi que leurs homologues, renforcés par des particules d’oxydes (ODS), sont envisagés comme matériaux de structure et de grainage pour les futures générations de réacteurs (GEN IV & Fusion). En effet, ces alliages ont une très bonne résistance mécanique ainsi qu’à la corrosion. Toutefois, sous irradiation, ils sont soumis à un flux de défauts qui engendre une ségrégation induite par l’irradiation (SII). Cette ségrégation hors équilibre a pour effet de changer la composition locale du matériau aux abords des puits de défauts, tels que les joints

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23

Hagège, Serge. "Contribution a l'etude des joints de grains en coincidence dans la symetrie hexagonale." Caen, 1985. http://www.theses.fr/1985CAEN2019.

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Les joints de grains peuvent etre decrits comme des joints en relation d'orientations de coincidence. Cette description necessite l'introduction d'une serie de parametres necessaires et suffisants pour caracteriser completement la relation d'orientation. Le rapport c/a de la symetrie hexagonale introduit une difficulte supplementaire qui conduit a discuter de la dimension de la coincidence et a envisager la notion de coincidence approchee. Applications aux macles de deformation des metaux hexagonaux compacts que l'on peut decrire comme des joints de coincidence. La notion de symetrie permet de

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24

Sahli, Salah. "Etude du comportement electrique de films minces de gaas amorphes ou polycristallins elabores par depots en phase vapeur ou par plasma a partir d'organometalliques." Toulouse 3, 1986. http://www.theses.fr/1986TOU30049.

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Des films de gaas polycristallin ont ete realises par depot en phase vapeur, a partir de molecules organometalliques. L'auteur a montre que les proprietes electriques de ce materiau semiconducteur sont controlees par les joints de grains. Une densite d'etats de surface uniforme entre les grains a ete mise en evidence. L'introduction entre les grains d'une phase amorphe de type si::(y)c::(1-y) modifie le mode de conduction. La resistivite des films augmente ou diminue suivant la valeur de la concentration de si::(y)c::(1-y). Un depot par plasma froid a partir des memes molecules que celles util

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25

Keast, Vicki J. "Analytical electron microscopy studies of grain boundary segregation and embrittlement /." Diss., 1998. 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:9914247.

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26

"Correlating Nanoscale Grain Boundary Composition with Electrical Conductivity in Ceria." Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.40741.

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abstract: Because of their favorable ionic and/or electronic conductivity, non-stoichiometric oxides are utilized for energy storage, energy conversion, sensing, catalysis, gas separation, and information technologies, both potential and commercialized. Charge transport in these materials is influenced strongly by grain boundaries, which exhibit fluctuations in composition, chemistry and atomic structure within Ångstroms or nanometers. Here, studies are presented that elucidate the interplay between macroscopic electrical conductivity, microscopic character, and local composition and electroni

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27

王亞帆. "A study of grain boundary scattering effect on thermoelectric properties of Bi0.5Sb1.5Te3 thin films." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/45299182080002435342.

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碩士<br>國立清華大學<br>材料科學工程學系<br>95<br>The effect of grain boundary potential scattering on thermoelectric properties of Bi0.5Sb1.5Te3 thin films has been investigated. Bi0.5Sb1.5Te3 is known to be the best p-type thermoelectric material at the room temperature regime. In this study, the Bi0.5Sb1.5Te3 thin films of various grain sizes were deposited at different substrate temperatures by the magnetron sputter deposition method. As the deposition temperature increases from room temperature to 200 ºC, the grain size of the sputtered Bi0.5Sb1.5Te3 thin films increase from 25nm to 100nm. The sputte

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28

Lee, Joon Hwan 1977. "In Situ Transmission Electron Microscopy Characterization of Nanomaterials." Thesis, 2012. http://hdl.handle.net/1969.1/148150.

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With the recent development of in situ transmission electron microscopy (TEM) characterization techniques, the real time study of property-structure correlations in nanomaterials becomes possible. This dissertation reports the direct observations of deformation behavior of Al2O3-ZrO2-MgAl2O4 (AZM) bulk ceramic nanocomposites, strengthening mechanism of twins in YBa2Cu3O7-x (YBCO) thin film, work hardening event in nanocrystalline nickel and deformation of 2wt% Al doped ZnO (AZO) thin film with nanorod structures using the in situ TEM nanoindentation tool. The combined in situ movies with qua

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29

Marquardt, Katharina [Verfasser]. "Grain boundary structure and element transport processes studied at the nm-scale using transmission electron microscopy (TEM) / vorgelegt von Katharina Marquardt (neé Hartmann)." 2010. http://d-nb.info/1012063194/34.

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30

Idowu, Oluwaseun Ayodeji. "Heat Affected Zone Cracking of Allvac 718Plus Superalloy during High Power Beam Welding and Post-weld Heat Treatment." 2010. http://hdl.handle.net/1993/3911.

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The present dissertation reports the findings of a study of cracking behavior of a newly developed superalloy, Allvac 718Plus during high power beam welding and post-weld heat treatment. Microstructures of the base alloy, heat affected zone (HAZ) and fusion zone (FZ) of welded and post-weld heat treated (PWHT) coupons were examined by the use of standard metallographic techniques involving optical microscopy, analytical scanning electron microscopy (SEM) and analytical transmission electron microscopy. Moreover, grain boundary segregation behavior of boron atoms during pre-weld heat treatments

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