DIELECTRIC TUNABILITY OF BAXSR1-XTIO3 THIN FILMS GROWN ON A COMPLIANT SUBSTRATE

The phase transition temperature and dielectric tunability of BaxSr1-xTiO(BST) thin films grown on a compliant substrate are theoretically investigated using the Ginzburg-Landau-Devonshire theory combined with the Timosheko elastic theory by considering thin films and substrates thickness-dependent relaxation of lattice-mismatch strain. Our results indicate that the dielectric characteristics of BST thin films deposited on compliant substrates are different from those of their bulk counterparts. The ferroelectricity and dielectric performances of the BST thin films can be modulated by changing the thickness ratio of the film to substrate or the stress state. This is an effectively theoretical guidance for the property optimization of ferroelectric thin films used in microwave devices.
Dielectric tenability Ferroelectric thin film Stress control Compliant substrate
Hua-ping WU Bin XU Xiao-yan LU
Key Laboratory of E&M (Zhejiang University of Technology), Ministry of Education & Zhejiang Province School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
国际会议
深圳
英文
449-452
2011-12-09(万方平台首次上网日期,不代表论文的发表时间)