Effects of Ca and Zr substitution upon structure and properties of Ba{sub 5}LaTi{sub 3}Ta{sub 7}O{sub 30} low-loss dielectric ceramics

Effects of Ca and Zr substitution upon the dielectric properties of Ba{sub 5}LaTi{sub 3}Ta{sub 7}O{sub 30} ceramics were investigated together with the structural characterization. All the samples of Ba{sub 5}La(Zr{sub x}Ti{sub 1-x}){sub 3}Ta{sub 7}O{sub 30} formed a filled tungsten-bronze structure...

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Bibliographic Details
Published inMaterials research bulletin Vol. 39; no. 9
Main Authors Sun, Y.H., Chen, X.M
Format Journal Article
LanguageEnglish
Published United States 02.07.2004
Subjects
CERAMICS
DIELECTRIC MATERIALS
MATERIALS SCIENCE
PERMITTIVITY
SOLID SOLUTIONS
TEMPERATURE COEFFICIENT
TUNGSTEN BRONZE
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Summary:Effects of Ca and Zr substitution upon the dielectric properties of Ba{sub 5}LaTi{sub 3}Ta{sub 7}O{sub 30} ceramics were investigated together with the structural characterization. All the samples of Ba{sub 5}La(Zr{sub x}Ti{sub 1-x}){sub 3}Ta{sub 7}O{sub 30} formed a filled tungsten-bronze structures, whereas the solid solution limit was determined as x=0.25 in (Ca{sub x}Ba{sub 1-x}){sub 5}LaTi{sub 3}Ta{sub 7}O{sub 30}. Beyond this limit secondary phase of CaTa{sub 2}O{sub 6} was detected and it would become the major phase for the Ca-rich compositions. The temperature coefficient of dielectric constant was improved with increasing Zr content while the dielectric constant decreased and the low dielectric loss varied little (in the order of 10{sup -4}). In the case of (Ca{sub x}Ba{sub 1-x}){sub 5}LaTi{sub 3}Ta{sub 7}O{sub 30}, small temperature coefficient of dielectric constant could be obtained with increasing Ca content while the dielectric constant decreased significantly, and a small amount substitution of Ca for Ba induced decrease in dielectric loss.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2004.04.008