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Pyroelectric and Dielectric Properties of Mn Modified 0.82Bi 0.5 Na 0.5 TiO 3 –0.18Bi 0.5 K 0.5 TiO 3 Lead‐Free Thick Films
Author(s) -
Zhang Haibo,
Jiang Shenglin,
Kajiyoshi Koji
Publication year - 2009
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.1551-2916.2009.03166.x
Subject(s) - pyroelectricity , figure of merit , materials science , dielectric , dopant , doping , dielectric loss , analytical chemistry (journal) , optoelectronics , ferroelectricity , chemistry , chromatography
MnO‐doped 0.82Bi 0.5 Na 0.5 TiO 3 –0.18Bi 0.5 K 0.5 TiO 3 (NBT–KBT) thick films with thickness about 40 μm have been prepared using screen printing on Pt electroded alumina substrates. The strong pyroelectric coefficient of 3.8 × 10 −4 C·(m 2 ·°C) –1 was observed in 1.0 mol% MnO‐doped‐thick films, and the calculated detectivity figure of merit as high as 1.1 × 10 −5 Pa −0.5 , which can be comparable to that of the commonly used lead based materials. The enhancement of the pyroelectric performances is attributed to the reductions in dielectric constant and loss and the improvements in the pyroelectric coefficient, which can be ascribed to the Mn acts as a hard dopant in the NBT–KBT lattice, creating oxygen vacancies and pinning the residual domains.