Дисертації з теми "GdCoO3"
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Leghari, S. B. "Transport and thermal properties of GdCo2." Thesis, Swansea University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637873.
Повний текст джерелаTrefon-Radziejewska, Dominika. "Wpływ domieszkowania na zależności temperaturowe dyfuzyjności cieplnej monokryształów YAG, YVO4 i GdCOB." Rozprawa doktorska, Katowice : Uniwersytet Śląski, 2012. https://repolis.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=44225.
Повний текст джерелаTrefon-Radziejewska, Dominika. "Wpływ domieszkowania na zależności temperaturowe dyfuzyjności cieplnej monokryształów YAG, YVO4 i GdCOB." Doctoral thesis, Katowice : Uniwersytet Śląski, 2012. http://hdl.handle.net/20.500.12128/5344.
Повний текст джерелаNguyen, Thanh Nam. "Fabrication et études des propriétés magnétiques et de transport de films de GdCo, de multicouches à base de GdCo et de multicouches Fe/Cr." Université Joseph Fourier (Grenoble), 2007. http://www.theses.fr/2007GRE10236.
Повний текст джерелаMöckel, Robert. "Growth and properties of GdCa4O(BO3)3 single crystals." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2012. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-90095.
Повний текст джерелаIn a series of 18 growth experiments, GdCa4O(BO3)3 (GdCOB) single crystals were successfully grown by the Czochralski method. They have a well-ordered structure, as revealed by single crystal structure analysis. Although the main growth direction was along the crystallographic b-axis, some experiments were conducted using the cdirection. Pulling velocities were varied between 1 and 3mm/h. Except for a few crystals with cracks or elongated "silk-like" inclusions consisting of multiphase impurities, most of the obtained crystals are of good quality. Those inclusions contain iridium, deriving from the crucible, P and Yb with unclear source, and other phases from the system Gd2O3–B2O3–CaO. Thermal expansion coefficients of GdCOB were determined in the directions of the crystallographic axes and found to be approximately linear in two temperature ranges: from 25° C to around 850° C, and from 850 to 1200° C, with the latter range showing significantly higher coefficients (below 850° C: alpha_a=11.1, alpha_b=8.6, alpha_c=13.3 10^-6/K, and above 850° C: alpha_a=14.1, alpha_b=11.7, alpha_c=17.8 x10^-6/K). This sudden increase of thermal expansion coefficients indicates a phase transition of higher order. An order-disorder transition in form of the rotation of BO3-triangles in the structure was made tentatively responsible for this transition, as revealed by HT-Raman spectroscopy. This transition was also detected by DSC-methods but appeared to result in very weak effects. Although the material is thought to represent a promising candidate for high temperature piezoelectric applications (noncentrosymmetric space group Cm), this effect of change in specification has not been described and it is unknown whether it has influence on the piezoelectric properties. Furthermore, this characteristic behaviour in combination with anisotropic coefficients may be the reason for the development of cracks during cooling of crystals, making the growth difficult. Spectroscopic investigation revealed a wide transparency range from 340 to 2500nm (29 400–4000 cm^-1) of GdCOB, which is a very important property for optical applications
Hamzaoui, Saad. "Domaines et parois magnétiques dans les alliages amorphes de terre rare métal de transition GdFe et Gd Co et du type métal de transition métalloide NiCoP et CoTi." Paris 11, 1985. http://www.theses.fr/1985PA112164.
Повний текст джерелаRare earth–Transition metal amorphous thin films of Gd Co and Gd Fe have been observed by electron microscope using Lorentz method and low angle diffraction. The magnetic domains observed before and after annealing indicate magnetostrictive character of the samples and their affinity to oxygen. The small in-plane lozenge type domains have been nucleated in the Co Ni P and Co Ti films and observed by longitudinal Keff effect. Experimental results of the critical domain size have been compared with the theoretical investigations. The static and dynamics of the zigzag domain walls which are composed of several lozenge-type domains have been shown. The mechanism of zigzags propagation is explained by transverse field effect and transformation of asymmetric Bloch wall into asymmetric Néel wall and vice versa. A micromagnetic model of this transformation has been established by isolated wall behaviour in a static state
Conraux, Yann. "Préparation et caractérisation d’un alliage amorphe ferrimagnétique de GdCo entrant dans la conception de jonctions tunnel magnétiques : résistance des jonctions tunnel magnétiques aux rayonnements ionisants." Université Joseph Fourier (Grenoble), 2005. http://www.theses.fr/2005GRE10148.
Повний текст джерелаThe magnetic random access memories (MRAM) are on the way to supplant the other forms of random access memories using the states of electric charge, and this thanks to their many technical advantages: not-volatility, speed, low consumption power, robustness. Also, the MRAM are alleged insensitive with the ionizing radiations, which was not checked in experiments until now. The current architecture of the MRAM is based on the use of magnetic tunnel junctions (MTJ). These MRAM can present an important disadvantage, because they are likely of present errors of addressing, in particular when integration (density of memory cells) is increasingly thorough. The work undertaken during this thesis relates to these two points: - to check the functional reliability of the MRAM containing JTM exposed to high energy ionizing radiations ; - to study a ferrimagnetic amorphous alloy, GdCo, likely to enter the composition of JTM and allowing to free from the possible errors of addressing by a process of thermal inhibition of the memory cells. This work of thesis showed that the MRAM containing JTM preserve their functional properties fully when they are subjected to intense ionizing radiations, and that GdCo is a very interesting material from the point of view of the solid state physics and magnetism, that its physical properties are very promising as for its applications, and that its integration in a JTM still claims technological developments
Augé-Rochereau, Frédérika. "Etude de nouveaux lasers solides pompes par diode a base de cristaux de ca 4gdo(bo 3) 3 (gdcob) dopes au neodyme et a l'ytterbium. Developpement d'un laser cr 4 + : yag pour des applications aux telecommunications." Paris 11, 1999. http://www.theses.fr/1999PA112257.
Повний текст джерелаHellström, Jonas. "On diode-pumped solid-state lasers." Doctoral thesis, KTH, Tillämpad fysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4580.
Повний текст джерелаQC 20100713
Cugat, Orphée. "Réalisation d'un magnétomètre à effet Kerr : propriétés magnéto-optiques de couches minces d'alliages amorphes terres rares-métaux de transition." Grenoble 1, 1991. http://www.theses.fr/1991GRE10005.
Повний текст джерелаTUNG, LIN, and 林彤. "Effects of Dopants on the Microstructure and Electrical Property of GdCoO3 Cathode Material for Solid Oxide Fuel Cell Application." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ufkq9c.
Повний текст джерела國立臺北科技大學
材料科學與工程研究所
106
In this study, Gd1-xMxCoO3±δ and GdCo1-xMxO3±δ ceramics with perovskite structure were synthesized by solid state reaction method. These materials were chosen based on their conductive mechanism and when mixed with ionic and electronic conductors (MIEC) they can increase the conduction of O2- and electron conduction capacity. In order to improve the electrical conductivity for use as SOFC cathodes, these ceramics were doped with various dopants such as Li+, Na+, K+, Ca2+, Mg2+, Sm3+, Ce4+, Nb5+, substituting into the Gd3+ sites or Co3+ sites in GdCoO3 lattices. The concentration of dopants Na+, K+, Ca2+ and Mg2+ in Gd1-xMxCoO3±δ and GdCo1-xMxO3±δ ceramics were controlled at 0.0 to 0.03, respectively. The experimental results showed that when GdCoO3 doped with Na+, K+, Ca2+ and Mg2+ increased their electrical conductivities but no effect on their sintering temperatures (1250◦C) and even reduce the sintering temperature to 1200oC.
Aarthi, T. "Kinetics of Photocatalytic Degradation of Dyes, Organics and Polymers using Nanomaterials." Thesis, 2007. https://etd.iisc.ac.in/handle/2005/4636.
Повний текст джерелаTrefon-Radziejewska, Dominika. "Wpływ domieszkowania na zależności temperaturowe dyfuzyjności cieplnej monokryształów YAG, YVO4 i GdCOB." Rozprawa doktorska, 2012. https://delibra.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=44225.
Повний текст джерелаMougel, Frédéric. "Les oxoborates de calcium et de terres rares (TR) Ca4TRO(BO3)3. Une nouvelle famille de matériaux à fonctions multiples pour l'optique : croissance cristalline, propriétés non linéaires et laser." Phd thesis, 1999. http://pastel.archives-ouvertes.fr/pastel-00001068.
Повний текст джерелаThanh, Nam Nguyen. "Elaboration et caractérisation des propriétés magnétiques et de transport de films et multicouches à base de GdCo et de multicouches Fe/Cr." Phd thesis, 2007. http://tel.archives-ouvertes.fr/tel-00406637.
Повний текст джерелаL'étude de la GMR des multicouches Fe/Cr traite de la contribution des interfaces au mécanisme GMR. En variant l'épaisseur du fer et en recuisant les multicouches, il est possible d'accéder aux contributions d'interface.
Conraux, Yann. "Préparation et caractérisation d'un alliage amorphe ferrimagnétique de GdCo entrant dans la conception de jonctions tunnel magnétiques Résistance des jonctions tunnel magnétiques aux rayonnements ionisants." Phd thesis, 2005. http://tel.archives-ouvertes.fr/tel-00182425.
Повний текст джерела