Manifestation of a thermochromic phase transition in electronic spectra of C3H7NH3CuCl3 crystals

被引：0
|
作者：
Yu. M. Korchak
B. S. Fedor
I. I. Polovynko
V. P. Rudyk
机构：
[1] Ivan Franko Lviv National University,Scientific
[2] Hetman P. Sahaydachnyi Army Academy,Technical and Educational Centre of Low
[3] Ivan Franko Lviv National University,Temperature Studies
来源：
Journal of Applied Spectroscopy | 2012年 / 79卷
关键词：
absorption spectrum; phase transition; exciton–phonon interaction; isopropylammonium trichlorocuprate; thermochromism;
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学科分类号：
摘要：
The temperature evolution of absorption spectra of isopropylammonium trichlorocuprate (C3H7NH3CuCl3) crystals was investigated in the energy range 1.77–2.48 eV. It was established that the optical absorption edge was described by the Urbach rule and resulted from exciton–phonon interaction. A comparatively strong exciton–phonon interaction was associated with a band produced by self-trapped excitons. Analysis of the temperature dependences for the Urbach-rule parameters confirmed the existence of a thermochromic phase transition at 325 K.
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页码：243 / 247
页数：4
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