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Doping and grain size effects on pyroelectric properties of Ba 0.7 Sr 0.3 TiO 3 for uncooled infrared bolometer
Author(s) -
Zhang Guangzu,
Jiang Shenglin,
Zeng Yike,
Zhang Yangyang,
Zhang Qingfeng,
Yu Yan,
Wang Jing
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201127226
Subject(s) - pyroelectricity , materials science , grain size , dielectric , doping , figure of merit , dielectric loss , analytical chemistry (journal) , infrared , grain growth , ceramic , dopant , mineralogy , optoelectronics , ferroelectricity , optics , composite material , chemistry , physics , chromatography
Ba 0.7 Sr 0.3 TiO 3 (BST) ceramics with different dopants and various grain sizes were fabricated by the solid‐state reaction process, and the doping and grain size effects on dielectric and dc bias field‐induced pyroelectric properties were systemically investigated. When acceptors were added, the dielectric loss of the BST was decreased effectively, whereas the pyroelectric coefficient was decreased for the broadening of dielectric constant peaks. With the increase of the content of acceptors and the adding of donors simultaneously, the decrease of pyroelectric coefficient caused by the doping effect could be weakened. The dielectric and dc bias field‐induced pyroelectric properties were also affected by the grain size effects dramatically. In this paper, the best pyroelectric coefficient of 105 × 10 −8 C/cm 2 °C and figure‐of‐merit of 22 × 10 −5 Pa −0.5 could be obtained when the grain size was 1 µm. The systemic investigation of doping and grain size effects would contribute to the development of high pyroelectric properties of BST for uncooled infrared detector.