Colossal permittivity and the polarization mechanism of (Mg, Mn) co-doped LaGaO3 ceramics

Luo, T, Liu, Z, Zhang, F and Li, Y 2018, 'Colossal permittivity and the polarization mechanism of (Mg, Mn) co-doped LaGaO3 ceramics', Journal of Applied Physics, vol. 123, no. 12, pp. 1-6.

Document type: Journal Article
Collection: Journal Articles

Title Colossal permittivity and the polarization mechanism of (Mg, Mn) co-doped LaGaO3 ceramics
Author(s) Luo, T
Liu, Z
Zhang, F
Li, Y
Year 2018
Journal name Journal of Applied Physics
Volume number 123
Issue number 12
Start page 1
End page 6
Total pages 6
Publisher American Institute of Physics
Abstract Mg and Mn co-doped LaGa0.7-xMgxMn0.3O3 (x = 0, 0.05, 0.10, 0.15) ceramics were prepared by a solid-state reaction method. The electrical properties of the LaGa0.7-xMgxMn0.3O3 ceramics were studied in detail by dielectric spectra, impedance spectra, and I-V characteristic analysis. Colossal permittivity up to 104 could be obtained across the frequency range up to 104 Hz. The impedance analysis of the co-doped LaGaO3 ceramics indicated that the Mott's variable range hopping (VRH) polarization should be the main origin of colossal permittivity. Mg and Mn co-doping suppressed the formation of Mn3+ and enhanced the VRH polarization, resulting in increased permittivity. Partial localization of electrons by Mg reduced the long-range electron hopping and led to the decrease in dielectric loss.
Subject Engineering not elsewhere classified
Mathematical Sciences not elsewhere classified
Physical Sciences not elsewhere classified
Keyword(s) Range-Hopping Conduction
Rutile Tio2
Dielectric Permittivity
Lanthanum Gallate
DOI - identifier 10.1063/1.5013264
Copyright notice © 2018 Author(s)
ISSN 0021-8979
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