Готові списки джерел за темами / GdCoO3

Добірка наукової літератури з теми "GdCoO3"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "GdCoO3"

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Dudnikov, V. A., D. A. Velikanov, N. V. Kazak, C. R. Michel, J. Bartolome, A. Arauzo, S. G. Ovchinnikov, and G. S. Patrin. "Antiferromagnetic ordering in REM cobaltite GdCoO3." Physics of the Solid State 54, no. 1 (January 2012): 79–83. http://dx.doi.org/10.1134/s106378341201009x.

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Duparc, Marion, Henrik Hovde Sønsteby, Ola Nilsen, Anja Olafsen Sjåstad, and Helmer Fjellvåg. "Atomic Layer Deposition of GdCoO3 and Gd0.9Ca0.1CoO3." Materials 13, no. 1 (December 19, 2019): 24. http://dx.doi.org/10.3390/ma13010024.

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Thin films of the catalytically interesting ternary and quaternary perovskites GdCoO3 and Gd0.9Ca0.1CoO3 are fabricated by atomic layer deposition using metal β-diketonates and ozone as precursors. The resulting thin films are amorphous as deposited and become single-oriented crystalline on LaAlO3(100) and YAlO3(100/010) after post-annealing at 650 °C in air. The crystal orientations of the films are tunable by choice and the orientation of the substrate, mitigated through the interface via solid face epitaxy upon annealing. The films exhibit no sign of Co2+. Additionally, high-aspect-ratio Si(100) substrates were used to document the suitability of the developed process for the preparation of coatings on more complex, high-surface-area structures. We believe that coatings of GdCoO3 and Gd1−xCaxCoO3 may find applications within oxidation catalysis.
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Pillai, C. G. S., and A. M. George. "High-temperature thermal conductivity of NdCoO3 and GdCoO3." International Journal of Thermophysics 12, no. 1 (January 1991): 207–21. http://dx.doi.org/10.1007/bf00506132.

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Mahata, Partha, T. Aarthi, Giridhar Madras, and Srinivasan Natarajan. "Photocatalytic Degradation of Dyes and Organics with Nanosized GdCoO3." Journal of Physical Chemistry C 111, no. 4 (February 2007): 1665–74. http://dx.doi.org/10.1021/jp066302q.

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ЛОПАТИН, С. И., И. А. ЗВЕРЕВА та И. В. ЧИСЛОВА. "ПАРООБРАЗОВАНИЕ И ТЕРМОДИНАМИЧЕСКИЕ СВОЙСТВА СЛОЖНЫХ ОКСИДОВ GDFEO3 И GDCOO3". Журнал Общей Химии 90, № 8 (1 серпня 2020): 1297–303. http://dx.doi.org/10.31857/s0044460x20080181.

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Dong, Q. Y., K. Y. Hou, X. Q. Zhang, L. Su, L. C. Wang, Y. J. Ke, H. T. Yan, and Z. H. Cheng. "Giant reversible magnetocaloric effect in antiferromagnetic rare-earth cobaltite GdCoO3." Journal of Applied Physics 127, no. 3 (January 21, 2020): 033904. http://dx.doi.org/10.1063/1.5132864.

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Lopatin, S. I., I. A. Zvereva, and I. V. Chislova. "Vaporization and Thermodynamic Properties of GdFeO3 and GdCoO3 Complex Oxides." Russian Journal of General Chemistry 90, no. 8 (August 2020): 1495–500. http://dx.doi.org/10.1134/s1070363220080174.

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Bucur, Raul Alin, Iuliana Badea, Alexandra Ioana Bucur, and Stefan Novaconi. "Dielectric, ferroelectric and piezoelectric proprieties of GdCoO3 doped (K0.5Na0.5)NbO3." Journal of Alloys and Compounds 630 (May 2015): 43–47. http://dx.doi.org/10.1016/j.jallcom.2015.01.030.

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Zhang, Liqin, Haifeng Chen, Yaohua Xu, Peisong Tang, Yanhua Tong, and Yangbin Ding. "Preparation of GdCoO3 by Sol-Gel Method and Its Photocatalytic Activity." Integrated Ferroelectrics 219, no. 1 (September 2, 2021): 204–10. http://dx.doi.org/10.1080/10584587.2021.1911367.

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Lenka, R. K., T. Mahata, P. K. Patro, A. K. Tyagi, and P. K. Sinha. "Synthesis and characterization of GdCoO3 as a potential SOFC cathode material." Journal of Alloys and Compounds 537 (October 2012): 100–105. http://dx.doi.org/10.1016/j.jallcom.2012.05.061.

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Більше джерел

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.

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Trefon-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.

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Анотація:
The aim of this thesis entitled “Influence o f doping on thermal diffusivity dependence on temperature of single crystals of YAG, YVOj i GdCOB’’ was to determine the thermal diffusivity of YAG, YVC>4, and GdCOB single crystals as a function of temperature, and to investigate an influence of dopants on these dependencies. To realize this purpose new experimental setup for the determination of thermal diffusivity dependence on temperature of transparent samples was built. The study was carried out for crystals which belong to different crystal systems: the yttrium aluminum garnet (YAG) having cubic structure, yttrium orthovanadate (YV04) of tetragonal structure and gadolinium calcium oxoborate (GdCOB) crystallizing in the monoclinic structure. The crystals were doped with calcium ions, rare earth ions such as ytterbium, neodymium, thulium, and transition metal vanadium. The influence of doping and temperature in rangę from 30 °C to 300 °C on the thermal diffusivity was analyzed. An anisotropy of thermal conductivity of investigated samples was also taken into account. Obtained results confirmed, that the influence of doping on the thermal diffusivity of investigated materials strongly depends on temperature. The thermal diffusivity of all investigated samples decreases with increasing of sample temperature from 30 °C to 300 °C, but the drop in the thermal diffusivity is the highest for pure single crystals. The introduction of dopant ions into a crystal lattice leads to a significant reduction in the thermal diffusivity at lower temperatures in comparison with pure crystals. However, the influence of dopants becomes less pronounced with increasing temperature, and in the case o f weakly doped crystals it becomes negligible at higher temperatures. The interpretation of obtained thermal diffusivity dependence on temperature for pure and doped single crystals was based on the Debye model of lattice thermal conductivity of solids. It was assumed that the decrease in thermal diffusivity with temperature and increasing concentration of impurities is caused by shortening of the phonons mean free path due to phonon-phonon and phonon-point defect scatterings. Dopant ions create additional phonon scattering centers which cause a drop of thermal diffusivity of doped crystals in comparison with pure ones. At the same time an increase of crystal temperature lowers the thermal diffusivity because of increasing freąuency of phonon-phonon scattering. This mechanism at higher temperatures prevails on phonon scattering on dopants, what is evident in the measured thermal diffusivity dependency on temperature for the doped crystals. All the aims and scopes of this thesis have been completed, the results presented at conferences, and published in international journals.
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Trefon-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.

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Анотація:
The aim of this thesis entitled “Influence o f doping on thermal diffusivity dependence on temperature of single crystals of YAG, YVOj i GdCOB’’ was to determine the thermal diffusivity of YAG, YVC>4, and GdCOB single crystals as a function of temperature, and to investigate an influence of dopants on these dependencies. To realize this purpose new experimental setup for the determination of thermal diffusivity dependence on temperature of transparent samples was built. The study was carried out for crystals which belong to different crystal systems: the yttrium aluminum garnet (YAG) having cubic structure, yttrium orthovanadate (YV04) of tetragonal structure and gadolinium calcium oxoborate (GdCOB) crystallizing in the monoclinic structure. The crystals were doped with calcium ions, rare earth ions such as ytterbium, neodymium, thulium, and transition metal vanadium. The influence of doping and temperature in rangę from 30 °C to 300 °C on the thermal diffusivity was analyzed. An anisotropy of thermal conductivity of investigated samples was also taken into account. Obtained results confirmed, that the influence of doping on the thermal diffusivity of investigated materials strongly depends on temperature. The thermal diffusivity of all investigated samples decreases with increasing of sample temperature from 30 °C to 300 °C, but the drop in the thermal diffusivity is the highest for pure single crystals. The introduction of dopant ions into a crystal lattice leads to a significant reduction in the thermal diffusivity at lower temperatures in comparison with pure crystals. However, the influence of dopants becomes less pronounced with increasing temperature, and in the case o f weakly doped crystals it becomes negligible at higher temperatures. The interpretation of obtained thermal diffusivity dependence on temperature for pure and doped single crystals was based on the Debye model of lattice thermal conductivity of solids. It was assumed that the decrease in thermal diffusivity with temperature and increasing concentration of impurities is caused by shortening of the phonons mean free path due to phonon-phonon and phonon-point defect scatterings. Dopant ions create additional phonon scattering centers which cause a drop of thermal diffusivity of doped crystals in comparison with pure ones. At the same time an increase of crystal temperature lowers the thermal diffusivity because of increasing freąuency of phonon-phonon scattering. This mechanism at higher temperatures prevails on phonon scattering on dopants, what is evident in the measured thermal diffusivity dependency on temperature for the doped crystals. All the aims and scopes of this thesis have been completed, the results presented at conferences, and published in international journals.
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Nguyen, 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.

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Möckel, 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.

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Анотація:
In der vorliegenden Arbeit wird die Einkristallzüchtung nach dem Czochralskiverfahren von GdCa4O(BO3)3 (GdCOB) beschrieben. Aus insgesamt 18 Zuchtversuchen, bei denen auch die Ziehgeschwindigkeit zwischen 1 und 3mm/h variiert wurde, wurden erfolgreich nahezu perfekte Einkristalle gewonnen. In einigen Kristallen traten jedoch auch Risse oder Einschlüsse auf. Diese enthielten neben Iridium vom Tiegelmaterial auch andere Phasen des Gd2O3–B2O3–CaO-Systems, sowie P und Yb, deren Herkunft unklar ist. Als Hauptziehrichtung wurde die kristallographische b-Achse gewählt, ergänzt durch einige Experimente in der c-Richtung. In den drei kristallographischen Hauptrichtungen wurden die thermischen Ausdehnungskoeffizienten von GdCOB bestimmt. Diese können in zwei nahezu lineare Bereiche unterteilt werden: von Zimmertemperatur bis etwa 850° C und von 850 bis 1200° C, wobei die Koeffizienten im Hochtemperaturbereich deutlich höher sind (unter 850° C: alpha_a=11.1, alpha_b=8.6, alpha_c=13.3 10^-6/K, oberhalb 850° C: alpha_a=14.1, alpha_b=11.7, alpha_c=17.8 10^-6/K). Daraus ergibt sich, dass ein Phasenübergang höherer Ordnung vorliegen muss. Als mögliche Ursache wurde mittels HT-Raman Spektroskopie ein Ordnungs-Unordnungs-Übergang identifiziert, während dessen die BO3-Gruppen in der Struktur leicht rotieren. Weitere Untersuchungen mittels thermodynamischer Methoden führten zu schwachen, aber eindeutigen Signalen, die diesem Effekt ebenfalls zuzuordnen sind. Obwohl das Material ein vielversprechender Kandidat für piezoelektrische Anwendungen im Hochtemperaturbereich ist, wurde dieser Effekt bisher unzureichend beschrieben. Dieses Verhalten, kombiniert mit den anisotropen thermischen Ausdehnungskoeffizienten, könnte eine der Ursachen für das Vorkommen von Rissen in den Kristallen während der Synthese darstellen. Spektroskopische Untersuchungen ergaben einen großen Transparenzbereich von 340 bis 2500nm (29 400–4000 cm^-1), was für optische Anwendungen von großer Bedeutung ist
In 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
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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.

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Анотація:
Les couches minces d’alliages amorphes de terre rare métal de transition GdCo et GdFe préparées par pulvérisation cathodique présentent une texture colonnaire et une structure en chaîne observées par microscopie électronique et diffraction aux petits angles. Le comportement de l’anisotropie magnétique et l’apparition de plusieurs structures magnétiques dans GdFe avant et après recuit révèlent leur caractère magnétostrictif et leur affinité pour l’oxygène. La nucléation des domaines magnétiques à aimantation plane, leur observation par effet Kerr longitudinal et l’étude de l’évolution de leur taille sont réalisées. Une étude théorique menée en parallèle permet de comprendre comment agissent les différents paramètres sur la taille critique de ces domaines. La structure des domaines en zigzag est étudiée en statique. On montre que l’aspect dynamique de cette dernière peut s’expliquer grâce au comportement d’une paroi de Bloch asymétrique sous l’effet d’un champ transverse appliqué, et du modèle micromagnétique établi dans l’étude statique
Rare 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
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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.

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Анотація:
Les mémoires magnétiques à accès aléatoire (MRAM) sont en passe de supplanter les autres formes de mémoires à accès aléatoire utilisant des états de charge électrique, et ce grâce à leurs nombreux avantages techniques : non-volatilité, rapidité, faible consommation énergétique, robustesse. Egalement, les MRAM sont prétendues insensibles aux rayonnements ionisants, ce qui n'a pas été vérifié expérimentalement jusqu'à présent. L'architecture actuelle des MRAM est basée sur l'utilisation de jonctions tunnel magnétiques (JTM). Ces MRAM peuvent présenter un inconvénient de taille, car elles sont susceptibles d'exhiber des erreurs d'adressage, en particulier lorsque l'intégration (la densité de points mémoire) est de plus en plus poussée. Le travail mené pendant cette thèse concerne ces deux points : - vérifier la fiabilité fonctionnelle des MRAM à base de JTM exposées aux rayonnements ionisants de haute énergie ; - étudier un alliage amorphe ferrimagnétique, le GdCo, susceptible d'entrer dans la composition de JTM et permettant de s'affranchir des éventuelles erreurs d'adressage par un processus d'inhibition thermique des points mémoire. Ces travaux de thèse ont démontré que les MRAM à base de JTM conservent pleinement leurs propriétés fonctionnelles lorsqu'elles sont soumises à un rayonnement ionisant intense, et que le GdCo est un matériau très intéressant du point de vue de la physique du solide et du magnétisme, que ses propriétés physiques sont très prometteuses quant à ses applications, et que son intégration dans une JTM réclame encore des évolutions technologiques
The 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
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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.

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Анотація:
Le but de ce travail etait, d'une part, de realiser un laser cr 4 + : yag continu pour pomper des amplificateurs a fibre optique dopee erbium pour les telecommunications optiques et, d'autre part, un laser a base d'un nouveau materiau autodoubleur dope nd 3 + ou yb 3 +, le ca 4gdo(bo 3) 3 ou gdcob. Le laser cr 4 + : yag nous a donne d'excellents resultats avec un gain superieur a 20 dbm sur une plage de 60 nm de la longueur d'onde signal pour une puissance de 238 mw couplee dans la fibre. La matrice de gdcob, facile a elaborer en grande dimension, a decouper et a polir et de bonne qualite optique, presente un seuil de dommage comparable au lbo, un coefficient non lineaire effectif de 1 pm/v. Son acceptance thermique tres importante (>50\c. Cm) evite d'avoir reguler finement le cristal en temperature. L'emission infrarouge produite par les ions de neodyme est autodoublee en frequence in situ par la matrice de gdcob si le cristal est correctement oriente. L'autodoublage de frequence en pompage par diode a ainsi ete demontre pour la premiere fois dans le nd:gdcob. Une puissance de 115 mw a ete obtenue pour une puissance de pompe absorbee de 1,25 w. La realisation de microlasers emettant le vert est en cours d'etude. L'etude du cristal yb:gdcob a montre que ce cristal possedait un gain eleve, en particulier lorsqu'il est pompe a 976 nm : l'effet laser est obtenu pour des miroirs de sortie de transmission superieure a 10%. Une puissance de 814 mw a 1030 nm pour une puissance absorbee de 1,3 w a 976 nm a ete mesuree. Un modele theorique permet de predire le comportement d'un laser quasi-trois niveaux, modele entierement valide experimentalement grace a l'etude menee sur le laser yb:gdcob. De plus, un laser yb:gdcob femtoseconde est en cours de developpement. Ces resultats montrent tout l'interet du cristal de gdcob et du laser cr 4 + : yag. Mais il reste beaucoup de travail a effectuer, dans les deux cas pour en cerner pleinement tout le potentiel.
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Hellström, 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.

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The research that is presented in this thesis can be divided into two major parts. The first part concerns longitudinally pumped, bulk Er-Yb lasers. In these lasers, the main limitation is the thermal shortcomings of the phosphate glass host material. From the laser experiments and the spectroscopic measurements on crystalline host materials, as well as an investigation to bring further light to the physical background of the involved dynamics, the thesis presents some novel results that contribute to the search for a crystalline replacement. The second part concerns novel laser concepts applied to Yb-doped double tungstate lasers. Different crystal orientations are investigated, such as an athermal orientation for reduced thermal lensing and a conical refraction orientation for complete polarization tuning. Furthermore, the introduction of volume Bragg gratings in the cavity enables wide spectral tuning ranges and extremely low quantum defects. Regarding the first part, the main results are the achievement of 15 % slope efficiency in a monolithic, continuous-wave Yb:GdCOB laser and the achievement of Q-switching of the same laser. The Q-switched pulse durations were around 5-6 ns and the Q-switched slope efficiency was 11.6 %. For both lasers, a maximum output power of 90 mW was obtained, which is close to ordinary glass lasers under similar conditions. A spectroscopic investigation into the Er,Yb-codoped double tungstates was also performed and the results have enabled mathematical modeling of the fluorescence dynamics in these materials. Finally, the temperature dependence of the dynamics in Er,Yb:YAG was studied and the results have given some insight into the physical background of the mechanisms involved. Regarding the second part, different end-pumped Yb:KReW laser cavities were constructed to demonstrate the different concepts. With a laser crystal cut for propagation along the athermal direction at 17º angle clockwise from the dielectric direction Nm, the thermal lens could be reduced by 50 %. In these experiments the maximum output power was 4 W at 60 % slope efficiency. In another cavity incorporating a volume Bragg grating in a retroreflector set-up, the wavelength could be continuously tuned between 997 - 1050 nm. The spectral bandwidth was 10 GHz and the peak output power was 3 W. The same output power could also be obtained at 1063 nm with the grating positioned as an output coupler instead. If, on the other hand, the grating was positioned as an input coupler, 3.6 W output power at 998 nm was obtained at a quantum defect of only 1.6 %. Furthermore, using a crystal oriented for propagation along an optic axis, internal conical refraction could be used to establish arbitrary control of the polarization direction as well as the extinction ratio. Even unpolarized light could be enforced despite the highly anisotropic medium. With this configuration, the maximum output power was 8.6 W at 60 % slope efficiency which equals the performance of a reference crystal with standard orientation. The completely novel concepts of laser tuning with Bragg grating retroreflectors, of low quantum defect through Bragg grating input couplers and of polarization tuning by internal conical refraction can all easily be applied to several other laser materials as well.
QC 20100713
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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.

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Анотація:
Une synthese de la description macroscopique des effets magneto-optiques, ainsi qu'un resume des principaux resultats experimentaux obtenus precedemment par effet kerr sur les metaux de transition et certains alliages magnetiques, sont presentes. Un magnetometre pour mesures magneto-optiques a ete realise. Il est automatise et fonctionne sous ultra-vide (5. 10##1#0 torr), a des temperatures comprises entre 17 k et 300 k, et dans des champs magnetiques atteignant 20 koe. Des solutions originales a divers problemes techniques rencontres ont ete mises en uvre. En particulier les bobines supraconductrices ont ete scellees de facon etanche a l'interieur d'une enceinte en acier inoxydable, un ensemble porte-miroirs d'usinage extremement rigoureux a ete realise, une canne de manipulation de l'echantillon utilisant des aimants permanents de haute performance ainsi qu'une canne de transfert rapide garantissant un tres bon vide secondaire ont ete concues et realisees. Un banc optique qui utilise l'effet kerr transversal (ekt) a ete construit, et une technique differentielle de mesure a ete developpee qui utilise la separation du faisceau lumineux incident sur l'echantillon en deux faisceaux correspondant respectivement a ses deux composantes de polarisation. Enfin, dans le programme d'automatisation, un sous-programme de traitement de donnees a ete mis au point pour compenser les divers bruits affectant la mesure. Des couches minces d'alliages amorphes terre rare-metal de transition (r-m) d'epaisseurs 1000 a et 1 m ont ete preparees par pulverisation cathodique et leurs proprietes magneto-optiques ont ete mesurees. Le signal ekt est au premier ordre proportionnel au moment du metal de transition dans les alliages y-co et y-ni, et la constante de proportionnalite pour y-co est le double de celle pour y-ni. Dans les alliages r-co (ou r=gd, nd, er, est magnetique), le signal ekt de gd est negligeable par rapport a celui de co, et de signe oppose. Le signal de nd est d'un ordre de grandeur superieur a celui de gd et s'oppose lui aussi a celui de co. Les variations thermiques des aimantations de nd et de co etant differentes, un maximum dans la variation thermique du signal ekt se produit dans les alliages nd-co. Dans er-co, les signaux ekt de er et de co sont de meme signe, et le signal de l'alliage decroit rapidement avec la temperature
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Частини книг з теми "GdCoO3"

1

Suski, W., and T. Palewski. "GdCrS3." In Pnictides and Chalcogenides II, 939–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/10713485_253.

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2

Posypaiko, V. I., and E. A. Alekseeva. "GdCl3." In Phase Equilibria in Binary Halides, 198–99. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-9024-4_67.

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3

Holze, Rudolf. "Ionic conductance of GdCl3." In Electrochemistry, 892. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_839.

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Silva, Renilson A. da, R. N. Saxena, A. W. Carbonari, and G. A. Cabrera-Pasca. "Investigation of hyperfine interactions in GdCrO3 perovskite oxide using PAC spectroscopy." In HFI / NQI 2010, 53–58. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-1269-0_11.

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5

Maksymowicz, L. J., and D. Sendorek. "Surface Modes in Magnetic Thin Amorphous Films of GDCOMO Alloys." In Physics of Solid Surfaces 1984, 199–200. Elsevier, 1985. http://dx.doi.org/10.1016/s0167-2991(08)65133-2.

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Тези доповідей конференцій з теми "GdCoO3"

1

Mahana, Sudipta, U. Manju, and D. Topwal. "Complex magnetic behavior in GdCrO3." In DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980766.

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2

Sundarayya, Y., S. N. Kaul, and S. Srinath. "Synthesis and magnetic properties of GdCrO3 nanoparticles." In NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4917767.

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3

Afreen, Sharika, Shahid Husain, Aref Alqahtani, Anand Somvanshi, and Mehroosh Fatema. "Structure and morphological study of Mn doped GdCrO3." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PHYSICS OF MATERIALS AND NANOTECHNOLOGY ICPN 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0008997.

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4

Gaur, N. K., Rasna Thakur, and Rajesh K. Thakur. "Specific heat and thermal expansion of GdCoO[sub 3]." In SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4791484.

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Thakur, Rasna, Rajesh K. Thakur, and N. K. Gaur. "Thermal behaviour of GdCo1-xMnxO3 cobaltates." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5033170.

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6

Lupei, Aurelia, E. Antic-Fidancev, Gerard Aka, Daniel Vivien, L. Gheorghe, and Cristian Gheorghe. "Spectral and structural studies of GdCOB and YCOB crystals." In SPIE Proceedings, edited by Valentin I. Vlad. SPIE, 2004. http://dx.doi.org/10.1117/12.582803.

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Ray, Avijeet, and Tulika Maitra. "First principles study of transport gap in zircon and scheelite type of GdCrO4." In DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980570.

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Funada, S., T. Nishimura, Y. Shiota, S. Kasukawa, M. Ishibashi, T. Moriyama, and T. Ono. "Spin Wave Propagation in Ferrimagnetic GdCo." In 2019 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2019. http://dx.doi.org/10.7567/ssdm.2019.ps-9-08.

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Loiko, Pavel, Xavier Mateos, Yicheng Wang, Zhongben Pan, Konstantin Yumashev, Huaijin Zhang, Haohai Yu, Uwe Griebner, and Valentin Petrov. "Thermo-Optic Dispersion Formulas for YCOB and GdCOB Laser Host Crystals." In Advanced Solid State Lasers. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/assl.2015.am2a.7.

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Lupei, Aurelia, E. Antic-Fidancev, Gerard Aka, and Daniel Vivien. "Electronic and vibronic structure of Yb3+ in GdCOB." In SPIE Proceedings, edited by Valentin I. Vlad. SPIE, 2004. http://dx.doi.org/10.1117/12.582804.

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Звіти організацій з теми "GdCoO3"

1

Good, William Stanley. Magnetic X-Ray Scattering Study of GdCo2Ge2 and NdCo2Ge2. Office of Scientific and Technical Information (OSTI), January 2002. http://dx.doi.org/10.2172/804538.

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2

Lee, S. J. Optical and magneto-optical properties of single crystals of RFe{sub 2} (R = Gd, Tb, Ho, and Lu) and GdCo{sub 2} intermetallic compounds. Office of Scientific and Technical Information (OSTI), February 1999. http://dx.doi.org/10.2172/348925.

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