作者:Yoshio Masuda、Wataru Morita、Akihiko Yahata、Yasuhiko Yukawa
DOI:10.1016/s0040-6031(98)00327-x
日期:1998.9
Abstract The thermal phase transition of rubidium formate, observed at 363 K, was studied by means of thermal analysis and X-ray diffraction method. The transition was found to be a reversible first-order transition. In the phase transition, the orthorhombic phase ( Pca 2 1 ) with lattice constants a =9.229(1), b =4.630(2) and c =7.408(2) A, was transformed to the monoclinic phase ( P 2 1 / m ) with
摘要 通过热分析和X 射线衍射方法研究了在363 K 下观察到的甲酸铷的热相变。发现该转变是可逆的一阶转变。在相变过程中,晶格常数 a =9.229(1), b =4.630(2) 和 c =7.408(2) A 的正交相 ( Pca 2 1 ) 转变为单斜相 ( P 2 1 / m ) 与 a =4.6552(4), b =4.6528(7), c =7.5170(6) A 和 γ =97.610(6)° 之一。跃迁的焓Δ H tr 和熵变Δ S tr 的值分别为0.42±0.02 kJ mol -1 和1.16±0.05 J K -1 mol -1 。虽然铷原子的相对位置在转变前后的相中几乎没有变化,但甲酸离子的取向在两相中是不同的。