Anomalous compression behavior of germanium during phase transformation

作者：Yan, Xiaozhi; Tan, Dayong; Ren, Xiangting; Yang, Wenge^*; He, Duanwei; Mao, Ho-Kwang

来源：Applied Physics Letters, 2015, 106(17): 171902.

DOI：10.1063/1.4919003

• SUPERPLASTICITY
• PRECIPITATION
• RELAXATION
• PRESSURE
• STRENGTH
• KINETICS
• IRON

In this article, we present the abnormal compression and plastic behavior of germanium during the pressure-induced cubic diamond to beta-tin structure transition. Between 8.6 GPa and 13.8 GPa, in which pressure range both phases are co-existing, first softening and followed by hardening for both phases were observed via synchrotron x-ray diffraction and Raman spectroscopy. These unusual behaviors can be interpreted as the volume misfit between different phases. Following Eshelby, the strain energy density reaches the maximum in the middle of the transition zone, where the switch happens from softening to hardening. Insight into these mechanical properties during phase transformation is relevant for the understanding of plasticity and compressibility of crystal materials when different phases coexist during a phase transition.

• 出版日期2015-4-27
• 单位中国科学院; 中国工程物理研究院; 中国工程物理研究院流体物理研究所; 中国科学院广州地球化学研究所