Effect of biphase on dielectric properties of Bi-doped lead strontium titanate thin films

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.09.007· OSTI ID:21494114

Li, X T ^[1]; Zhao, Y L; Tu, Y; Dai, J L; Weng, W J; Han, G R; Song, C L ^[1]

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1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China)

Pb{sub 0.4}Sr{sub 0.6}TiO{sub 3} (PST) thin films doped with various concentration of Bi were prepared by a sol-gel method. The phase status, surface morphology and dielectric properties of these thin films were measured by X-ray diffraction (XRD), scanning electron microscopy (SEM) and impedance analyzer, respectively. Results showed that the thin films with the maximum dielectric constant and minimum dielectric loss were obtained for x=0.15. For x<0.15, only pure PST perovskite phase were in the thin films. For 0.2<x<0.4, the PST/Bi{sub 2}Ti{sub 2}O{sub 7} biphase were obtained. The thin films with pure Bi{sub 2}Ti{sub 2}O{sub 7} pyrochlore phase were obtained for x=0.67. The biphase thin films had high tunability and high figure of merit (FOM). The FOM of PST/Bi{sub 2}Ti{sub 2}O{sub 7} biphase thin film was about 6 times higher than that thin films formed with pure perovskite phase or pure pyrochlore phase. - Graphical abstract: The Bi-doped Pb{sub 0.4}Sr{sub 0.6}TiO{sub 3} (PST) thin films prepared by the sol-gel method showed a PST/Bi{sub 2}Ti{sub 2}O{sub 7} biphase structure for 0.2<x<0.4, and had the low dielectric capacitance and dielectric loss. Display Omitted

• OSTI ID: 21494114
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 11 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALKALINE EARTH METAL COMPOUNDS
BISMUTH
COHERENT SCATTERING
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DIFFRACTION
DOPED MATERIALS
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ELEMENTS
FILMS
IMPEDANCE
LEAD COMPOUNDS
MATERIALS
METALS
MICROSCOPY
MINERALS
MORPHOLOGY
OXIDE MINERALS
OXYGEN COMPOUNDS
PERFORMANCE
PERMITTIVITY
PEROVSKITE
PEROVSKITES
PHYSICAL PROPERTIES
PYROCHLORE
SCANNING ELECTRON MICROSCOPY
SCATTERING
SOL-GEL PROCESS
STRONTIUM COMPOUNDS
STRONTIUM TITANATES
THIN FILMS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION