High-temperature ordering of structural vacancies in the cobalt-rich portion of the binary system Co–Ge

X-ray powder diffraction analysis, macroscopic density measurement and light microscopical methods were used for the investigation of the ordering of structural vacancies in the high-temperature phase Co 3Ge 2. The heat treated alloy of the composition Co 58Ge 42 (bulk specimen: 43 h at 700 °C; powd...

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Bibliographic Details
Published in:Journal of alloys and compounds 2005-02, Vol.388 (2), p.230-234
Main Authors: Audebrand, N., Ellner, M., Mittemeijer, E.J.
Format: Article
Language:English
Subjects:
Chemical Sciences
Exact sciences and technology
Ordered phases
Physics
Structural vacancies
Transition metal compounds
X-ray diffraction
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Summary:X-ray powder diffraction analysis, macroscopic density measurement and light microscopical methods were used for the investigation of the ordering of structural vacancies in the high-temperature phase Co 3Ge 2. The heat treated alloy of the composition Co 58Ge 42 (bulk specimen: 43 h at 700 °C; powder specimen: 43 h at 700 °C) showed the crystal structure of Co 3Ge 2: Pearson–Parthé symbol ( hP22-1.7), space group P6 3/ mmc, Fe 2− x Ge type, a = 7.7541(8) Å, c = 4.991(1) Å. The distribution of structural vacancies as determined for the high-temperature phase Co 3Ge 2 differs from the one for the quasihomologous phase Ni 19Ge 12. This effect is caused by the difference in filling of the 3d band for the late transition metals cobalt and nickel.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2004.07.024