Crystallineamorphous transitions of GeSe alloys by mechanical grinding
Crystallineamorphous transitions of GeSe alloys by mechanical grinding
复制标题
通过机械研磨实现 GeSe 合金的晶态非晶态转变
DOI：
10.1016/s0022-3093(01)00788-8
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发表时间：
2001
影响因子：
3.5
通讯作者：
J. Hidaka
中科院分区：
文献类型：
--
作者：
Y. Tani;Y. Shirakawa;A. Shimosaka;J. Hidaka
研究了球磨过程中Se和GeSe2的X射线衍射和差示扫描量热(DSC)测量。在本研究中，非晶态Se和GeSe2是通过机械研磨(MG)来合成的，这种方法被认为是一种诱导晶态-非晶态相变的方法。Se的非晶化是由范德华力连接的螺旋链之间的扭曲引起的。快淬法Se的结晶热ΔH比MG法的低。这一结果表明，ΔH的差异与中间区结构的差异相对应。单斜晶系GeSe2通过相互连接的四面体之间的无序发生非晶化。认为MG计算得到的GeSe2的四面体单元是扭曲的，分布很广。研磨4h后GeSe2完全非晶化，本球磨30h后GeSe2完全非晶化。这一差异表明，单斜晶系GeSe2中相连的四面体单元之间的无序比三角Se中链间的无序更容易引起。
X-ray diffraction and differential scanning calorimetry (DSC) measurements of Se and GeSe2during ball milling have been investigated. In this study, amorphous Se and GeSe2are synthesized by mechanical grinding (MG) recognized as a method of inducing a crystalline–amorphous phase transition. The amorphization of Se is caused from distortion between helical chains connected by van der Waals forces. The enthalpy ΔH for crystallization of Se by rapid quench is lower than that by the MG. This result suggests that the difference of ΔH corresponds to that of the structures in intermediate range. Monoclinic GeSe2is amorphized by disordering between the connected tetrahedra. It is considered that the tetrahedral unit of GeSe2by the MG is distorted with wide distributions. GeSe2is completely amorphized after 4 h of grinding, and Se after 30 h in the present milling. The difference indicates that disordering between the connected tetrahedral units in monoclinic GeSe2is induced more easily than that between chains in trigonal Se.