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Fabrication and Characterization of Pyroelectric Ba 0.8 Sr 0.2 TiO 3 Thin Films by a Sol‐Gel Process
Author(s) -
Cheng JianGong,
Tang Jun,
Meng XiangJian,
Guo ShaoLing,
Chu JunHao,
Wang Min,
Wang Hong,
Wang Zhuo
Publication year - 2001
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.1151-2916.2001.tb00854.x
Subject(s) - pyroelectricity , materials science , thin film , dielectric , sol gel , fabrication , analytical chemistry (journal) , coercivity , dissipation factor , dielectric loss , mineralogy , nanotechnology , optoelectronics , ferroelectricity , condensed matter physics , chemistry , medicine , alternative medicine , physics , pathology , chromatography
A sol‐gel process was used to prepare pyroelectric Ba 0.8 Sr 0.2 TiO 3 thin films with large columnar grains (100–200 nm in diameter) on Pt/Ti/SiO 2 /Si substrates, via using a 0.05 M solution precursor. The relationship between dielectric constant and temperature (ɛ r ‐ T ) showed two distinctive phase transitions in the Ba 0.8 Sr 0.2 TiO 3 thin films. Both the remnant polarization and the coercive field decreased as the temperature increased from −73°C to 40°C. Its low dissipation factor (tan δ= 2.6%) and high pyroelectric coefficient ( p = 4.6 × 10 −4 C·(m 2 ·K) −1 at 33°C), together with its good insulating properties, made the prepared Ba 0.8 Sr 0.2 TiO 3 thin films promising for use in uncooled infrared detectors and thermal imaging applications.