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Origin of low dielectric loss and giant dielectric response in (Nb+Al) co‐doped strontium titanate
Author(s) -
He Zichen,
Cao Minghe,
Zhou Liang,
Zhang Lin,
Xie Juan,
Zhang Shujun,
Qi Junlei,
Hao Hua,
Yao Zhonghua,
Yu Zhiyong,
Liu Hanxing
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15762
Subject(s) - strontium titanate , dielectric , dielectric spectroscopy , materials science , raman spectroscopy , dielectric loss , doping , x ray photoelectron spectroscopy , analytical chemistry (journal) , permittivity , ceramic , condensed matter physics , nuclear magnetic resonance , chemistry , optoelectronics , composite material , optics , electrode , electrochemistry , physics , chromatography
(Nb+Al) co‐doped SrTiO 3 ceramics with a nominal composition of Sr(Nb 0.5 Al 0.5 ) x T i 1‐ x O 3 (x = 0, 0.02, 0.04, and 0.06) were fabricated using the conventional solid‐state reaction method; giant permittivity (10500) and low dielectric loss (0.03) were obtained at x = 0.06. Dielectric and impedance spectroscopy, X‐ray photoelectron spectroscopy, and Raman spectroscopy, were employed to study why the dielectric property improved. The results indicate that the giant dielectric response occurs because of the combined effects of the off‐center Ti 3+ reorientation and conduction of electrons with the polar ordering structure Ti 3+ /Ti 4+ . In contrast, the low dielectric loss can be attributed to electron localization that occurs because of the defect dipoleTi 4 + · e − V o · · − Ti 4 + · e . These fundamental understandings will benefit the design of doped SrTiO 3 ceramics with desired performance.