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- Title
Nonequivalent-F-induced relaxations in LaF single crystals over a broad temperature range.
- Authors
Wang, Jing; Wang, Chunchang; Sun, Xiaohong; Zhang, Jian; Zheng, Jun; Cheng, Chao; Wang, Hong; Li, Yide; Huang, Shouguo
- Abstract
The dielectric properties of LaF single crystals were investigated in the temperature range from 110 to 773 K and the frequency range from 100 Hz to 10 MHz. Two thermally activated relaxations (R1 and R2) and a dielectric anomaly (A) were observed. The lower temperature relaxation (R1) was ascribed to a polaronic relaxations due to fluorine ions diffusion within the F sublattice and fluorine ions hopping in F sublattice. The higher temperature relaxation (R2) is Maxwell-Wagner relaxation due to the blocking of electrodes associated with the ionic exchange between F and F sublattices and among the three nonequivalent sublattices. The anomaly appearing in the highest temperature range is related to the inductive effect arising from the coupled electron-ionic inductive response.
- Subjects
LANTHANUM compounds; SINGLE crystals; TEMPERATURE effect; DIELECTRIC properties; DIFFUSION; ION exchange (Chemistry)
- Publication
Journal of Materials Science, 2015, Vol 50, Issue 10, p3795
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-015-8944-x