RAMAN-SCATTERING AND FLUORESCENCE-SPECTRA OF LANBO4

被引：29

作者：

WADA, M ^{[1
]}

NAKAYAMA, Y ^{[1
]}

SAWADA, A ^{[1
]}

TSUNEKAWA, S ^{[1
]}

ISHIBASHI, Y ^{[1
]}

机构：

[1] TOHOKU UNIV,IRON STEEL & OTHER MET RES INST,SENDAI,MIYAGI 980,JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1979年 / 47卷 / 05期

关键词：

D O I：

10.1143/JPSJ.47.1575

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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. © 1979, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

引用

页码：1575 / 1580

页数：6

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