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Microstructural and electrical changes in Ca 0.9 R 0.1 CeNbMoO 8 ( R = Y, Sm, Nd, La) ceramics induced by rare‐earth ion doping
Author(s) -
Liu Yafei,
Fu Zhilong,
Chen Xingyu,
Wei Yaxin,
Zhang Bo,
Chang Aimin
Publication year - 2021
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.17670
Subject(s) - scheelite , ceramic , materials science , microstructure , ion , analytical chemistry (journal) , doping , mineralogy , electrical resistivity and conductivity , atmospheric temperature range , activation energy , temperature coefficient , thermistor , chemistry , metallurgy , thermodynamics , composite material , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , tungsten
Rare‐earth ions doped Ca 0.9 R 0.1 CeNbMoO 8 ( R = Y, Sm, Nd, La) ceramics have been successfully prepared by solid‐state method, and their modifications to the microstructure and electrical properties are also investigated. The rare‐earth ions doped ceramics exhibit the scheelite structure. With the increase in the radius of rare‐earth ions, the lattice distortion and bond interaction will be enhanced, and the consistency of grain size will be reduced. The ceramics exhibit negative temperature coefficient (NTC) thermistor characteristics in the temperature range of 473 K‐1273 K, and the activation energy decreases with the increase of the radius of rare‐earth ions. Rare‐earth ions doping can increase the content of Ce 3+ ions and promote the conductivity of ceramics. Except for Sm 3+ ‐doped ceramics, the high‐temperature aging rate of other ceramics is less than 2%. The existence of some metastable Sm 2+ ions in Sm 3+ ‐doped ceramics not only increases the activation energy, but also reduces the high‐temperature stability of the ceramics.