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Microstructure–Dielectric Properties Relationship in Ba 0.6 Sr 0.4 TiO 3 –Mg 2 SiO 4 –Al 2 O 3 Composite Ceramics
Author(s) -
Chen Ying,
Zhang YuanYuan,
Dong XianLin,
Wang GenShui,
Cao Fei
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.1551-2916.2009.03376.x
Subject(s) - dielectric , materials science , hysteresis , pyroelectricity , polarization (electrochemistry) , atmospheric temperature range , microstructure , analytical chemistry (journal) , ceramic , phase transition , dielectric loss , condensed matter physics , mineralogy , ferroelectricity , optoelectronics , thermodynamics , composite material , chemistry , physics , chromatography
0.60Ba 0.6 Sr 0.4 TiO 3 (BST)–(0.40− x )Mg 2 SiO 4 (MS)– x Al 2 O 3 ( x =0, 0.5, 3, 5wt%) composite ceramics exhibit excellent characteristics suitable for tunable device applications. With increasing amount of Al, the dielectric peak can be quantitatively broadened and suppressed; the “phase transition temperature” T c or ( T m ) shifts to a lower temperature. Meanwhile, the tunability is still high in a wider temperature range. Far from T c , pyroelectric effects are observed by using the Byer and Roundy technology and Slim polarization hysteresis loops are observed under high ac dielectric field at 10Hz. These proved the existence of spontaneous polarization in certain possible orientations in a broad temperature range above T c in the paraelectric medium and reveal why 0.60BST–(0.40− x )MS– x Al 2 O 3 have such remarkable dielectric nonlinearity.