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Formation of Core‐Shell Structure in the BaTiO 3 ‐SrTiO 3 System
Author(s) -
Kim JooSun,
Kang SukJoong L.
Publication year - 1999
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.1151-2916.1999.tb01882.x
Subject(s) - materials science , barium , strontium , phase (matter) , shell (structure) , dielectric , curie temperature , ferroelectricity , analytical chemistry (journal) , mineralogy , precipitation , crystallography , chemistry , condensed matter physics , composite material , metallurgy , physics , optoelectronics , organic chemistry , chromatography , ferromagnetism , meteorology
When a 1‐mol%‐Fe 2 O 3 ‐added 0.67BaTiO 3 ‐0.33SrTiO 3 (mole ratio) powder compact was sintered at 1380°C, a core‐shell structure was developed. The core phase formed via solid‐state interdiffusion of barium and strontium ions between BaTiO 3 and SrTiO 3 particles. In contrast, the shell phase formed via a solution‐precipitation process in the presence of an Fe 2 O 3 ‐containing liquid phase. Energy‐dispersive X‐ray analysis showed that the core was a strontium‐rich paraelectric phase and the shell was a barium‐rich ferroelectric phase at room temperature. The core‐shell structure developed in the BaTiO 3 ‐SrTiO 3 system suggests the possibility of obtaining a variety of phase distributions with different Curie temperatures.