Raman Scattering and Phase Transition in AgNa (NO_2)_2

概要

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Temperature dependence of the Raman spectrum of AgNa(NO,). has beenstudied. At low temreratures, the rz-sr>ectrum due to the bendinn vibration ofthe NOx tons in the cr.vsta1 consists of two comronents at 832 arxd 858 cm '.With increasing temperature, the third component becomes apprecxiable at 845cm ' near -40'C. The third and 858 cm ' components approach<cach other astemperature rises and merge together resulting in a broad band ab?ove T.. Near0'C, a weak shoulder becomes appreciable on the high energy tail of 832 cm 'component. The shoulder and 832 cm ' component also merge together andbecome a broad band above T.. The sum of their intensities decrea.ses monoto-nically as temperature rises and drops remarkably near T.. Assignments aregiven to the four components of the v.-spectrum by referring to the IR andluminescence spectra of the crystal, The results are also discussed in relation to thephase transition in the crystal.
社団法人日本物理学会の論文
1980-04-15