Ferroelectricity in sol-gel derived Ba0.8Sr0.2TiO3 thin films using a highly diluted precursor solution

Barium strontium titanate films with good ferroelectricity have been obtained by a developed sol-gel processing, using a highly dilute spin-on solution. X-ray diffraction and scanning electron microscopy investigations show that large grains with the size of 100–200 nm in the films are formed from h...

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Bibliographic Details
Published in:Applied physics letters 1999-10, Vol.75 (14), p.2132-2134
Main Authors: Cheng, Jian-Gong, Meng, Xiang-Jian, Li, Biao, Tang, Jun, Guo, Shao-Ling, Chu, Jun-Hao, Wang, Min, Wang, Hong, Wang, Zhuo
Format: Article
Language:English
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Summary:Barium strontium titanate films with good ferroelectricity have been obtained by a developed sol-gel processing, using a highly dilute spin-on solution. X-ray diffraction and scanning electron microscopy investigations show that large grains with the size of 100–200 nm in the films are formed from highly dilute spin-on solutions with layer-by-layer homoepitaxy. Polarization-electric field and dielectric constant-temperature (εr−T) measurements reveal that the ferroelectricity becomes more evident as the grain size increases. The measurements for quality Ba0.8Sr0.2TiO3 ferroelectric films derived from a 0.05 M solution have shown a remnant polarization of 3.5 μC/cm2, a coercive field of 86 kV/cm, and two distinctive phase transitions.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.124940