Inorganic Chemistry p. 3130 - 3133 (1995)
Update date:2022-08-30
Topics:
Masuda, Yoshio
Yahata, Akihiko
Ogawa, Hiroshi
The phase transition of cesium formate observed at around 36°C was found to be a reversible first-order transition by means of thermal analyses. The results of the Rietveld analysis of powder X-ray diffraction data showed that an orthorhombic phase (Pbcm, Z = 8; a = 4.785(1), b =9.553(9), and c = 15.927(2) ?) transformed to a cubic phase (Pm3m, Z = 1; a = 4.500(5) ?). The large values of enthalpy and entropy change for the transition (ΔHtr = 6.87 .+-. 0.28 kJ mol**-1 and ΔStr = 22.2 .+-. 0.9 J K**-1 mol**-1) were discussed on the basis of the change of the orientation freedom of the formate ion.
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