Ba{sub 0.5}Sr{sub 0.5}TiO{sub 3}-Bi{sub 1.5}Zn{sub 1.0}Nb{sub 1.5}O{sub 7} composite thin films with promising microwave dielectric properties for microwave device applications

Journal Article · Mon Oct 18 04:00:00 EDT 2004 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1785861· OSTI ID:20634335

Yan, L; Kong, L B; Chen, L F; Chong, K B; Tan, C Y; Ong, C K ^[1]

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1. Center for Superconducting and Magnetic Materials, Department of Physics, National University of Singapore, Lower Kent Ridge Crescent, Singapore 119260 (Singapore)

Crack-free, dense, and uniform Ba{sub 0.5}Sr{sub 0.5}TiO{sub 3}(BST)-Bi{sub 1.5}Zn{sub 1.0}Nb{sub 1.5}O{sub 7}(BZN) composite thin films were deposited on (100) LaAlO{sub 3} (100) SrTiO{sub 3}, 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 ({approx}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 {approx}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.

• OSTI ID: 20634335
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 85; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CERAMICS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
ENERGY BEAM DEPOSITION
LANTHANUM COMPOUNDS
LASER RADIATION
MAGNESIUM OXIDES
MICROSTRUCTURE
NIOBIUM OXIDES
PERMITTIVITY
PULSED IRRADIATION
SCANNING ELECTRON MICROSCOPY
STOICHIOMETRY
STRONTIUM TITANATES
THIN FILMS
X-RAY DIFFRACTION
ZINC COMPOUNDS