Pressure dependence of Raman-active phonons in rare earth disulfides, #alpha#'-LnS_2 (Ln: La, Pr, Nd)

Andrzej Grzechnik

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Pressure dependence of Raman-active phonons in rare earth disulfides, #alpha#'-LnS_2 (Ln: La, Pr, Nd)

机译：稀土二硫化物#alpha＃'-LnS_2（Ln：La，Pr，Nd）中拉曼活性声子的压力依赖性

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摘要

High-pressure behavior of layered #alpha#'-LnS_2 (Ln: La, Pr, Nd) rare earth disulfides (P2_1/b, C_(2h)~5, Z=4) with the distorted anti-Fe_2As structure (the PbFCl type, P4mm, D_(4h)~7), Z=2) is studied with Raman spectroscopy in a diamond anvil cell at room temperature. Upon compression, there occurs a phase transition in all three compounds to higher symmetry superstructures of the parent anti-Fe_2As structure. This transformation, associated with a hysteresis on decompression, takes place at about 5 GPa for #alpha#'-LaS_2 and #alpha#'-PrS_2, and at about 8 GPa for #alpha#'-NdS_2.

机译：具有扭曲的反Fe_2As结构（PbFCl）的层状#alpha＃'-LnS_2（Ln：La，Pr，Nd）稀土二硫化物（P2_1 / b，C_（2h）〜5，Z = 4）的高压行为在室温下，在金刚石砧盒中用拉曼光谱法研究了P4 / nmm，D_（4h）〜7），Z = 2）的P型。压缩后，所有三种化合物都发生相变，转变为母体抗Fe_2As结构的较高对称超结构。与减压时的滞后相关的这种转变对于#alpha＃'-LaS_2和#alpha＃'-PrS_2发生在大约5 GPa，对于#alpha＃'-NdS_2发生在大约8 GPa。

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《Physica, B. Condensed Matter》 |1999年第4期|共7页
作者
Andrzej Grzechnik;
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正文语种 eng
中图分类物理学;
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high pressure; Raman spectroscopy; rare earth disulfides; phase transitions;

机译：高压;拉曼光谱;稀土二硫化物;相变;

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Pressure dependence of Raman-active phonons in rare earth disulfides, #alpha#'-LnS_2 (Ln: La, Pr, Nd)

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