The lattice constants of Cs 2 MnBr 4 ·2H 2 O crystals grown by the slow evaporation method were determined by X-ray diffraction. The thermal stability of Cs 2 MnBr 4 ·2H 2 O was investigated as a function of its H 2 O content, and an endothermic peak at 378 K (= T p ) obtained by differential scanning calorimetry (DSC) was related to the loss of 2H 2 O. Thermogravimetric analysis (TGA) and DSC results revealed that Cs 2 MnBr 4 ·2H 2 O was transformed to Cs 2 MnBr 4 at temperatures above the T P . In addition, from 133 Cs magic angle spinning nuclear magnetic resonance (MAS NMR) results, one Cs site was observed at temperatures below the T P and two Cs sites above it. The change of the spin–lattice relaxation time T 1ρ near T P is related to variations in the symmetry of the octahedral Cs + environment consisting of four Br − ions and two water molecules, upon the loss of H 2 O.

中文翻译：

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Cs2MnBr4·2H2O晶体的热力学性质和固态分子动力学

通过X射线衍射测定了通过缓慢蒸发法生长的Cs 2 MnBr 4 ·2H 2 O晶体的晶格常数。研究了 Cs 2 MnBr 4 ·2H 2 O 的热稳定性与其 H 2 O 含量的函数关系，通过差示扫描量热法 (DSC) 获得的 378 K (= T p ) 处的吸热峰与2H 2 O。热重分析(TGA) 和DSC 结果表明Cs 2 MnBr 4 ·2H 2 O 在高于TP 的温度下转变为Cs 2 MnBr 4 。此外，根据 133 Cs 魔角自旋核磁共振 (MAS NMR) 结果，在 TP 以下的温度下观察到一个 Cs 位点，在其上方观察到两个 Cs 位点。