相变
材料科学
空间组
凝聚态物理
导线
结晶学
快离子导体
中子衍射
衍射
相(物质)
三角晶系
晶体结构
X射线晶体学
物理
化学
光学
复合材料
电解质
量子力学
电极
作者
Satoshi Hoshino,Takashi Sakuma,Yasuhiko Fujii
摘要
The phase transitions and the crystal structures of a superionic conductor Ag 3 SI were investigated by specific heat measurements and by X-ray as well as neutron diffraction methods. The transition entropies were measured to be 1.44 cal/mol·deg for the γ- β transition at 157 K and 2.71 cal/mol·deg for the β- α transition at 519 K. The least squares refinements of atomic positions and isotropic temperature factors were carried out. β-Ag 3 SI is cubic with space group Pm3m in which Ag is distributed into four positions apart 0.5 A from the face centered position toward [100], while in γ-Ag 3 SI below 157 K, Ag is located at one of these four positions obeying the symmetry of the rhombohedral space group R3. From these experimental results, it was found that the nature of the successive phase transitions in Ag 3 SI was not only of the order-disorder type but also of a structural phase transition. A comparison was made with the phase transition of CsPbCl 3 .
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