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R. Sato Turtelli, C. Bormio Nunes, L. C. Teixeira, R. Grössinger, P. A. Suzuki, C. Barbatti:
"Magnetostriction of polycrystalline Fe-Ge alloys";
Journal of Alloys and Compounds, 471 (2009), S. 52 - 55.

12, 15, 20) alloys were investigated in order to correlate the magnetostriction with microstructure. In order to obtain different microstructures in the Fe100−xGex alloys, the samples were annealed at 600 ◦C during 2 h and at 1150 ◦C for half hour and then quenched in coldwater. For Ge concentrations lower than 14 at.%, the longitudinal magnetostriction is positive and increases positively up to 22ppm at 12 at.% Ge then decreases and vanishes at about 14 at.% Ge. For further Ge concentration increase the longitudinal
magnetostriction is negative and reaches −30ppm for Fe80Ge20. This behavior, that is very similar to that reported for Fe-Si alloys, is explained by the structural changes caused by different thermal histories of the alloys.

http://dx.doi.org/10.1016/j.jallcom.2008.03.038