Raman Scattering and Fluorescence Spectra of LaNbO4

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  • Wada Mitsuo
    Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University
  • Nakayama Yoshinori
    Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University
  • Sawada Akikatsu
    Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University
  • Tsunekawa Shin
    The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Ishibashi Yoshihiro
    Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University

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タイトル別名
  • Raman Scattering and Fluorescence Spectra of LaNbO<SUB>4</SUB>
  • Raman Scattering and Fluorescence Spect

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The Raman and fluorescence spectra of LaNbO4 were observed in the temperature range from 15°C to 650°C with excitation light of various wavelengths. The lowest frequency phonon mode shows anomalous temperature dependence around a ferroelastic phase transition point Tc=495°C and splitting of the degenerate phonon modes was observed below Tc. These results are discussed, using a Landau-type free energy. In addition to the phonon modes, three fluorescence lines were observed at 20525 cm−1, 20460 cm−1 and 20427 cm−1. The intensity of these lines decreases exponentially as the temperature increases. These fluorescence lines seem to be due to lanthanide ions contained in the crystal as impurities.

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