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- W2000654074 abstract "Les systèmes Co-Ge et Ni-Ge ont été réexaminés en détail par analyse thermique différentielle, rayons X, micrographie, microsonde et microdureté, en particulier du côté riche en cobalt ou en nickel, région où se forment dans un faible intervalle de température des phases instables telles que Co4Ge et Ni5Ge2 très étroites, ainsi qu'une phase Ni3Ge (25,6 at.% Ge) distincte de la phase cubique (type AuCu3) de même formule, plus riche en nickel. On trouve par ailleurs les phases suivantes: Co5Ge2 étroite, stable entre 636 et 382 °C; Co5Ge3 assez large à haute température, avec une variété allotropique en dessous de 385 °C; CoGe également assez large; puis Co5Ge7 et CoGe2 étroites à fusions non-congruentes. Pour le système Ni-Ge, outre les deux phases instables de haute température Ni5Ge2 et Ni3Ge, on retrouve Ni5Ge3 et Ni3Ge larges et fondant de manière congruente, enfin NiGe étroite à fusion incongruente. Les deux systèmes se ressemblent par une notable solubilité du germanium dans le cobalt et le nickel (au maximum 17,5 at.% dans le cobalt, 16 at.% dans le nickel) et par la phase très large Co5Ge3 et Ni5Ge3 à fusion congruente et structure hexagonale de paramètres très voisins. Ils se distinguent par toutes les autres phases décelées. Les raisons de ces dissemblances sont discutées dans le cadre des autres alliages du germanium avec les métaux de transition. The Co-Ge and Ni-Ge binary systems were reinvestigated in detail by differential thermal analysis, X-ray diffraction, micrography, microhardness and X-ray microprobe analysis, in particular on the cobalt- and nickel-rich sides where unstable phases are formed within a small range of temperature and composition, e.g. Co4Ge, Ni5Ge2 and also Ni3Ge (25.6 at.% Ge) which is different from the AuCu3 type. We found the following phases: Co5Ge2, with a very narrow composition range, is stable between 636 and 382 °C; Co5Ge3 is non-stoichiometric with an allotropic transformation below 385 °C; CoGe is also non-stoichiometric; Co5Ge7 and CoGe2 are stoichiometric and melt incongruently. Ni5Ge2 only exists between 1102 and 1045 °C and Ni3Ge (25.6 at.% Ge) between 1118 and 1082 °C, whereas NiGe is only found with a stoichiometric composition. The two systems are only analogous in the solid solution of germanium in cobalt or nickel and in the high temperature form of the Hume-Rothery phase Ni5Ge3 or Co5Ge3. The possible reasons for their differences are discussed." @default.
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- W2000654074 title "Les systèmes binaires cobalt-germanium et nickel-germanium: Étude comparée" @default.
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- W2000654074 doi "https://doi.org/10.1016/0022-5088(80)90252-0" @default.
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