Abstract
The Cr-Ge system has been completely reinvestigated by thermal analysis, X-ray diffraction, microhardness and electron microprobe. The five known intermetallic phases melt incongruently: Cr 3Ge at 1564 °C (homogeneous from 20.5 up to 25 at.% Ge) and Cr 5Ge 3 at 1262 °C (37.4 − 38.2 at.% Ge) with an allotropic transformation at 1002 °C; the three other phases Cr 11Ge 8 (melting at 1170 °C), CrGe (998 °C) and Cr 11Ge 19 (928 °C) are stoichiometric. The solubility of germanium in solid chromium varies from 4 at.% (800 °C) up to 11 at.% (1564 °C). Chromium is practically insoluble in solid germanium at any temperature. The system is compared with other binary alloys of germanium with transition metals.
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