Raman Scattering and Phase Transition in AgNa(NO2)2

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  • Hangyo Masanori
    Department of Physics, Faculty of Science, Kyoto University
  • Kato Riso
    Department of Physics, Faculty of Science, Kyoto University

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  • Raman Scattering and Phase Transition in AgNa(NO<SUB>2</SUB>)<SUB>2</SUB>
  • Raman Scattering and Phase Transition i

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Temperature dependence of the Raman spectrum of AgNa(NO2)2 has been studied. At low temperatures, the ν2-spectrum due to the bending vibration of the NO2− ions in the crystal consists of two components at 832 and 858 cm−1. With increasing temperature, the third component becomes appreciable at 845 cm−1 near −40°C. The third and 858 cm−1 components approach each other as temperature rises and merge together resulting in a broad band above Tc. Near 0°C, a weak shoulder becomes appreciable on the high energy tail of 832 cm−1 component. The shoulder and 832 cm−1 component also merge together and become a broad band above Tc. The sum of their intensities decreases monotonically as temperature rises and drops remarkably near Tc. Assignments are given to the four components of the ν2-spectrum by referring to the IR and luminescence spectra of the crystal. The results are also discussed in relation to the phase transition in the crystal.

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