Single-step dip coating of crack-free BaTiO3 films >1 μm thick:: Effect of poly(vinylpyrrolidone) on critical thickness

被引:123
作者
Kozuka, H [1 ]
Kajimura, M [1 ]
机构
[1] Kansai Univ, Dept Mat Sci & Engn, Suita, Osaka 5648680, Japan
关键词
D O I
10.1111/j.1151-2916.2000.tb01330.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
BaTiO3 coating films were prepared from Ba(CH3COO)(2)-Ti(OC3H71)(4)-H2O-CH3COOH-C3H7OH solutions containing poly(vinylpyrrolidone) (PVP) via single-step, nonrepetitive dip coating. The critical thickness-i.e., the maximum film thickness achieved without crack formation via nonrepetitive dip coating-was successfully increased by incorporation of PVP in the precursor solution. Relatively dense, crack-free BaTiO3 films >1 mu m in thickness were achieved via single-step deposition using a solution containing PVP of average molecular weight of 630 000. Incorporation of an excess amount of PVP, however, led to a decrease in the critical thickness. High-molecular-weight PVP was more effective in increasing the critical thickness, whereas N-vinyl-2-pyrrolidone monomers did not affect the critical thickness. Stepwise heating of the gel films resulted in increased optical transmittance of the films, accompanied by film densification.
引用
收藏
页码:1056 / 1062
页数:7
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