Phase Transition in Single Crystal Cs2Nb4O11

Authors

Jianjun Liu, University of Nebraska at OmahaFollow
E. P. Kharitonova, Moscow State University, Leninskiye gory, 119992 Moscow, Russia
Chun-Gang Duan, University of Nebraska at Omaha
Wai-Ning Mei, University of Nebraska at OmahaFollow
Robert W. Smith, University of Nebraska at OmahaFollow
John R. Hardy, University of Nebraska-Lincoln

Document Type

Article

Publication Date

2005

Publication Title

The Journal of Chemical Physics

Volume

122

Issue

14

Abstract

We studied temperature dependence of complex capacitance, impedance, and polarized Raman spectra of single crystal Cs₂Nb₄O₁₁. First, we observed a sharp λ-shaped peak at 165 °C in the complex capacitance, then found drastic changes in the Raman spectra in the same temperature range. Utilizing the pseudosymmetry search of structure space group, we attributed the observed anomalies to a structural change from the room temperature orthorhombic Pnn2 to another orthorhombic Imm2. We also measured room temperature polarized Raman spectra in different symmetries of normal vibrations and assigned high wavenumber Raman bands to the internal vibrations of NbO₆ octahedra and NbO₄ tetrahedra.

Comments

Published in THE JOURNAL OF CHEMICAL PHYSICS 122, 144503 (2005). Copyright © 2005 American Institute of Physics. Used by permission.

Recommended Citation

Liu, Jianjun; Kharitonova, E. P.; Duan, Chun-Gang; Mei, Wai-Ning; Smith, Robert W.; and Hardy, John R., "Phase Transition in Single Crystal Cs2Nb4O11" (2005). Physics Faculty Publications. 8.
https://digitalcommons.unomaha.edu/physicsfacpub/8