A Raman scattering study of phase transitions in proustite (Ag3AsS3) and pyrargyrite (Ag3SbS3)
A Raman scattering study of phase transitions in proustite (Ag3AsS3) and pyrargyrite (Ag3SbS3)
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普氏石 (Ag3AsS3) 和吡咯石 (Ag3SbS3) 相变的拉曼散射研究
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
G. L. Paul
中科院分区：
文献类型：
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作者：
P. Ewen;W. Taylor;G. L. Paul
普氏铁矿和吡啶铁矿的拉曼光谱已在 4-540K 温度范围内记录。结果证实了普氏体在 29 和 58K 时存在结构相变，但没有为所建议的 10 和 140K（吡咯锌矿）以及 210K（普氏体）的相变提供证据。两种材料在 80K 以上存在银离子无序是从与 S-Ag-S 单元相关的某些谱线的异常展宽推断的，并得出结论，这种无序不一定与普氏体的转变有关。没有发现银离子无序导致任何向超离子相转变的证据。一些早期的模式分配被证明是不正确的，并且对于 proustite 来说，许多 TO-LO 分割得到了确认。评估了样品缺陷对吡啶石光谱的影响。
The Raman spectra of proustite and pyrargyrite have been recorded over the temperature range 4-540K. The results confirm the existence of structural phase transitions at 29 and 58K in proustite but do not give evidence for the suggested transitions at 10 and 140K (pyrargyrite) and 210K (proustite). The existence of Ag-ion disorder above 80K for both materials is inferred from the anomalous broadening of certain lines associated with S-Ag-S units and it is concluded that this disorder is not necessarily connected with the transitions in proustite. No evidence of any transition to a superionic phase resulting from the Ag-ion disorder was found. Some earlier mode assignments are shown to be incorrect and for proustite a number of TO-LO splittings are confirmed. The influence of sample imperfections on the spectrum of pyrargyrite is assessed.