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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Structural analysis of Cs2HgBr4 in normal, incommensurate and twinned phases
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Structural analysis of Cs2HgBr4 in normal, incommensurate and twinned phases

机译：Cs2HgBr4正常，不相称和孪生相的结构分析

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X-ray diffraction and Raman spectroscopy experiments have been used to investigate different phases of Cs2HgBr4, dicesium mercury tetrabromide, from room temperature to 213 K. Structural analyses have shown that the crystal could be described, in the normal and in the incommensurate phases, both by ordered and disordered models, but the latter gave more consistent results. Raman results corroborate the descriptions based on X-ray analysis; the presence of an extra peak, which according to group theory should be forbidden in an ordered structure, indicates the lack of local symmetry and was associated with an orientational disorder of [HgBr4](2-) tetrahedra. In the transition from the incommensurate to the commensurate phase a multi-soliton behavior was observed. The Cs2HgBr4 crystal in the low-temperature commensurate phase is composed of two types of ordered pseudomerohedral twinned domains. [References: 12]
机译：X射线衍射和拉曼光谱实验已用于研究从室温到213 K的Cs2HgBr4，四溴化铯二氢铯的不同相。结构分析表明，该晶体可以在正相和不相称相中进行描述。通过有序和无序的模型，但后者给出了更一致的结果。拉曼结果证实了基于X射线分析的描述;根据基团理论，应禁止在有序结构中出现额外的峰，这表明缺乏局部对称性，并与[HgBr4]（2-）四面体的取向紊乱有关。在从不相称到相称的转变中，观察到了多孤子行为。低温对应相中的Cs2HgBr4晶体由两种类型的有序伪面体孪晶畴组成。 [参考：12]

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