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Low‐temperature Maxwell‐Wagner relaxation in (Na + Nb) co‐doped rutile TiO 2 colossal permittivity ceramics
Author(s) -
Wang Chunchang,
Li Tianyu,
Xie Yuanmiao,
Wang Jin
Publication year - 2020
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.16883
Subject(s) - relaxation (psychology) , dielectric , rutile , condensed matter physics , doping , materials science , permittivity , cole–cole equation , dielectric permittivity , ceramic , depolarization , nuclear magnetic resonance , chemistry , optoelectronics , physics , composite material , psychology , social psychology , organic chemistry , medicine , endocrinology
The exact mechanism of the stunning colossal permittivity behavior found in (donor‐acceptor) co‐doped TiO 2 system still remains enigmatic. This behavior results from a thermally activated dielectric relaxation occurring below 50 K. Herein, thermally stimulated depolarization current analysis combined with dielectric investigation was used to disentangle this relaxation in (Na + Nb) co‐doped TiO 2 ceramics. We find that this relaxation is related to frozen electrons and features the Vogel‐Fulcher behavior and negative dielectric tunability. Our results reveal that this low‐temperature relaxation is a new kind of Maxwell‐Wagner relaxation. Differences between the low‐temperature Maxwell‐Wagner relaxation and its high‐temperature counterpart are discussed. This study provides new insights into the physics of the eye‐catching dielectric properties in co‐doped TiO 2 system.