Ba_0.5Sr_0.5TiO₃–Bi_1.5Zn_1.0Nb1.5O₇ composite thin films with promising microwave dielectric properties for microwave device applications

Yan, L.; Kong, L. B.; Chen, L. F.; Chong, K. B.; Tan, C. Y. and Ong, C. K. (2004). Ba_0.5Sr_0.5TiO₃–Bi_1.5Zn_1.0Nb1.5O₇ composite thin films with promising microwave dielectric properties for microwave device applications. Applied Physics Letters, 85(16) pp. 3522–3524.

DOI: https://doi.org/10.1063/1.1785861

Abstract

Crack-free, dense, and uniform Ba_0.5Sr_0.5TiO₃(BST)–Bi_1.5Zn_1.0Nb_1.5O₇(BZN) composite thin films were deposited on (100) LaAlO₃, (100) SrTiO₃, and (100) MgO substrates via a pulsed laser deposition, using a combined target of BST and BZN ceramics. Phase composition and microstructure of the BST-BZN thin films were characterized by x-ray diffraction and scanning electron microscopy. The films, on LAO, STO, and MgO substrates, showed zero-field microwave (-7.7 GHz) dielectric constants of 471, 435, and 401, dielectric loss tangents of 0.0048, 0.0043, and 0.0037, and dielectric tunabilities of 6.2%, 6.0%, and 5.7% at -8.1 kV∕cm, respectively. The good physical and electrical properties of the BST–BZN composite thin films make them promising candidates for microwave device applications.

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