Temperature dependent magnetoelastic properties of Fe100-xGex(5100measurements atx= 5.7, 12.1, 14.9, and 17.7 were performed between 78 K and 426 K and resonant ultrasound spectroscopy measurements were used to determine the shear elastic constant c' from 5 K to 300 K forx= 6.4, 7.2, 10.8, 14.6, 17.7 , and 17.9 . A clear distinction was observed between the temperature dependencies of lambda100for the A2 and D03phases of Fe100-xGex. The elastic constant c' displays a monotonic decrease with concentration through the different phases (6b1at 81 K were remarkably consistent with theoretical values determined by density functional calculations at 0 K.
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Petculescu et al. (2009) studied this question.
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