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Nontraditional temperature shift of the fundamental absorption edge for layered substances and the ferroelastic phase transition in CS3Bi2I9

机译:CS3Bi2I9中层状物质基本吸收边的非传统温度变化和铁弹性相变

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We have carried out investigations of the exciton reflection spectra of Cs3Bi2I9 layered crystals as a function of temperature. For the first time for the layered substances we have found nontraditional temperature shift of the energy gap E-g(T) described by the Varshni formula. We have registered a transition region in the temperature broadening of the half-width, H(T), of the exciton band with increasing of temperature in the interval between 150 and 220 K. It is shown that this region may be identified as the heterophase structure region where ferroelastic and paraclastic phases coexist. We have also found a surge in H(T) at the ferroelastic phase transition point (T-c = 220 K). (C) 2004 Elsevier Ltd. All rights reserved.
机译:我们已经研究了Cs3Bi2I9层状晶体的激子反射光谱随温度的变化。对于层状物质,我们首次发现由Varshni公式描述的能隙E-g(T)的非传统温度变化。我们已经在激子带的半宽度H(T)的温度展宽中记录了一个过渡区域,该过渡区域随着温度在150和220 K之间的增加而增加。这表明该区域可以被识别为异相铁弹性相和准碎屑相共存的结构区域。我们还发现在铁弹性相变点(T-c = 220 K)处H(T)激增。 (C)2004 Elsevier Ltd.保留所有权利。

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