Structural studies of decomposition in Fe–x

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• 作者：Hu Cao ; Feiming Bai ; Jiefang Li ; Dwight D. Viehl ; Thomas A. Lograsso ; Peter M. Gehring
• 关键词：Galfenol ; Decomposition ; X-ray diffraction ; Neutron diffraction
• 刊名：Journal of Alloys and Compounds
• 出版年：2008
• 出版时间：6 October 2008
• 年：2008
• 卷：465
• 期：1-2
• 页码：244-249
• 全文大小：965 K

文摘

Decomposition in Fe–x at. % Ga alloys subjected to different thermal treatments has been investigated by high-resolution X-ray and neutron diffraction for 12 < x < 25. Quenching suppresses the formation of a D0₃ structure in favor of a high-temperature disordered bcc (A2) structure. By contrast, annealing produces a two-phase mixture of A2 + D0₃ for 14 < x < 20 and a fully D0₃ phase for x = 25. Temperature dependent studies revealed that phase separation occurs below 650 °C on cooling for x = 20, where a notable radial line broadening develops. The splitting of the (2 0 0) and (0 0 2) Bragg peaks observed along the respective transverse directions indicates that the samples are composed of multiple crystal grains, slightly tilted with respect to each other.