Optical properties of antiferroelectric Cs2Nb4O 11: Absorption spectra and first-principles calculations

H. L. Liu*, C. R. Huang, G. F. Luo, W. N. Mei

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

3 引文 斯高帕斯(Scopus)

摘要

We report a joint experimental and theoretical investigation of the optical properties of Cs2Nb4O11. In room temperature optical absorption spectra, we found a direct gap about 3.55 0.05 eV and charge transfer excitations at about 4.96 and 6.08 eV, which are in good agreement with the first-principles calculations. Upon passing through the 165 C antiferroelectric to paraelectric phase transition, the peak energies of two charge transfer bands display almost no temperature dependence, yet they become even broader and exhibit enhanced oscillator strength. We infer this intriguing behavior as the manifestation of Nb cation distortions due to the charge-lattice interaction.

原文英語
文章編號103515
期刊Journal of Applied Physics
110
發行號10
DOIs
出版狀態已發佈 - 2011 十一月 15

ASJC Scopus subject areas

  • 物理與天文學 (全部)

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