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Preparation of Ba0.6Sr0.4TiO3Ceramics and Their Dielectric Properties

Author: ZhengYaJing
Tutor: MaTieCheng
School: Dalian University of Technology
Course: Materials Science
Keywords: barium strontium calcium titanate sol-gel process nano-powders granularity surface-active agent dielectric properties
CLC: TQ174.75
Type: Master's thesis
Year: 2008
Downloads: 2
Quote: 0
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Abstract


Ba1-xSrxTiO3(BST) is the important dielectric material, belongs to calcium-titaniumconfiguration, which is composed by BaTiO3and SrTiO3. BST owns higher insulationresistance, lower dielectric dissipation (in the high and low frequency), and higherdielectric-constant temperature stability. Electricity capability of BST is changed along withcontent of Sr (X), when X is less than0.5, it happen for first order phase change; when X ismore than0.5, it happen for second order phase change, which is disseminated. Disseminationis also changed along with content of Sr (X). BST is widely applied to minimized capacitor ofvolume smallness and capability bigness, multilayer substrate, sensor, semiconductor material,sense organ, memory element of electronic computer and so on.In this paper, Ba0.6Sr0.4TiO3nano-powders were prepared by sol-gel process. Thenano-powders were examined using XRD, SEM and Laser analyzer techniques. The effects ofsurface-active agent on performance of Ba0.6Sr0.4TiO3nano-powders were studied in detailusing FT-IR. The results indicate that adding suitable surface-active agent helps to improvethe superficial performance of Ba0.6Sr0.4TiO3and to exert nano-effect. Dielectric properties ofthe Ba0.6Sr0.4TiO3ceramics were characterized using a programmed cubical phase TH2818LCR analyzer.Preparation and dielectric characterization of Ba0.6Sr0.4TiO3ceramics by sol-geltechnique were studied. The factors affecting the formation of gels have been analyzed. Thereaction mechanism and the thermolysis process was analyzed by DTA、XRD and SEM. Theexperiment results showed that the powder.And synthetic temperature of Ba0.6Sr0.4TiO3powders with cubical phase were800℃，which are much lower than that by the conventional solid2state reaction method. Thesintering temperature of Ba0.6Sr0.4TiO3ceramics fall to1250℃, the overgrowth of the grain isconstrained and the average grain size was～0.5μm. The dielectric constant of theBa0.6Sr0.4TiO3ceramics were affected by the sintering temperature.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Ceramics > Industrial ceramic
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