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Effects of Bi 2 O 3 and Yb 2 O 3 on the Curie Temperature in BaTiO 3 ‐Based Ceramics
Author(s) -
Yao Guofeng,
Wang Xiaohui,
Yang Yang,
Li Longtu
Publication year - 2010
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/j.1551-2916.2010.03633.x
Subject(s) - curie temperature , materials science , dielectric , dopant , curie , condensed matter physics , analytical chemistry (journal) , ceramic , doping , grain size , mineralogy , chemistry , metallurgy , ferromagnetism , physics , optoelectronics , chromatography
Effects of doping Bi 2 O 3 and Yb 2 O 3 into BaTiO 3 ‐based ceramics were investigated. The Curie temperature shifted to a higher point with an increasing BiYbO 3 . Yb plays a major role and Bi has no influence on the Curie point, but Bi 2 O 3 is important because it can hinder the diffusion of other dopants and avoid the destruction of the “core–shell” structure. Moreover, the excess Bi 2 O 3 addition enhances the effect of Yb 2 O 3 on shifting T c . X‐ray diffraction analysis indicated that the c / a ratio increased with the increasing of BiYbO 3 . The rise of the Curie temperature is attributed to an internal stress caused by the lattice mismatch between grain cores and grain shells. The dielectric properties can also be explained by the “core–shell” structure.