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Colossal permittivity in TiO 2 co‐doped by donor Nb and isovalent Zr
Author(s) -
Yang Chao,
Wei Xianhua,
Hao Jianhua
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.15196
Subject(s) - materials science , dielectric spectroscopy , dielectric , permittivity , doping , dielectric loss , analytical chemistry (journal) , activation energy , dopant , x ray photoelectron spectroscopy , rutile , nuclear magnetic resonance , optoelectronics , electrode , chemistry , electrochemistry , physics , chromatography , organic chemistry
Effect of isovalent Zr dopant on the colossal permittivity ( CP ) properties was investigated in (Zr + Nb) co‐doped rutile TiO 2 ceramics, i.e., Nb 0.5% Zr x Ti 1− x O 2 . Compared with those of single Nb‐doped TiO 2 , the CP properties of co‐doped samples showed better frequency‐stability with lower dielectric losses. Especially, a CP up to 6.4 × 10 4 and a relatively low dielectric loss (0.029) of x = 2% sample were obtained at 1 kHz and room temperature. Moreover, both dielectric permittivity and loss were nearly independent of direct current bias, and measuring temperature from room temperature to around 100°C. Based on X‐ray photoelectron spectroscopy, the formation of oxygen vacancies was suppressed due to the incorporation of Zrions. Furthermore, it induced the enhancement of the conduction activation energy according to the impedance spectroscopy. The results will provide a new routine to achieve a low dielectric loss in the CP materials.