The Infrared Spectra and the Antiferroelectric Phase Transition of Copper Formate Tetrahydrate
The Infrared Spectra and the Antiferroelectric Phase Transition of Copper Formate Tetrahydrate
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四水甲酸铜的红外光谱和反铁电相变
DOI：
10.1246/bcsj.45.128
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发表时间：
1972
影响因子：
4
通讯作者：
J. Hiraishi
中科院分区：
文献类型：
--
作者：
J. Hiraishi
在不同温度下，在 4000 至 24 cm−1 的频率范围内测量四水甲酸铜的红外光谱。已知该化合物会在 -37.7°C 下经历反铁电相变。由于反铁电相中结晶水分子的解放和平移模式而产生的谱带与顺电相中的谱带有很大不同，而对于其他谱带，在两相中的光谱之间没有观察到明显的差异。这些事实与晶体学研究获得的结果一致，晶体学研究表明水分子的取向有序发生在相变时。还讨论了水分子的解放和平移模式与冰的相似性。
The infrared spectra of copper formate tetrahydrate are measured in the frequency region from 4000 to 24 cm−1 at various temperatures. This compound is known to undergo an antiferroelectric phase transition at −37.7°C. The bands due to the librational and translational modes of the crystalline water molecules in the antiferroelectric phase are quite different from those in the paraelectric phase, while no appreciable differences between the spectra in the two phases are observed for other bands. Those facts agree with the results obtained by the crystallographic study, which show that the ordering of the orientation of the water molecules occurs at the phase transition. The similarity of the librational and the translational modes of the water molecules to those of ice is also discussed.