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Abstract

Differential thermal analysis and dilatometry investigations of Fe–Gd alloys in the range 5–16·6 at.-% Gd showed the occurrence of a phase transformation at about 1215°C. From X-ray diffraction investigations, it was concluded that this corresponds to an allotropic change in Fe₁₇Gd₂ from the rhombohedral Zn₂Th₂ type at low temperature to the hexagonal Ni₁₇Th₂ type at high temperature. Both these structures were detected in as cast samples of Fe–Gd and Fe–Tb alloys. However, in the Fe₁₇Tb₂ compound, no transformation was detected by differential thermal analysis.

MST/1227

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Crystal structure of compounds Fe 17 Gd 2 and Fe 17 Tb 2

Abstract

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