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Dielectric ceramics in the BaO–Sm2O3–TiO2–Ta2O5 quaternary system

Published online by Cambridge University Press:  31 January 2011

X. M. Chen ,
Z. Y. Xu  and
J. Li
X. M. Chen
Affiliation:
Laboratory of Materials for Electronics and Communication, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Z. Y. Xu
Affiliation:
Laboratory of Materials for Electronics and Communication, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
J. Li
Affiliation:
Laboratory of Materials for Electronics and Communication, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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Extract

Dielectric ceramics in the BaO–Sm2O3–TiO2–Ta2O5 quaternary system were prepared and characterized for five typical compositions: BaSm5Ti7Ta3O30, Ba2Sm4Ti6Ta4O30, Ba3Sm3Ti5Ta5O30, Ba4Sm2Ti4Ta6O30, and Ba5SmTi3Ta7O30. The latter three compositions tended to form the tungsten–bronze phase, and the ceramics based on these compositions had a high dielectric constant (134–175) and a low dielectric loss (on the order of 10−3) but a larger temperature coefficient of the dielectric constant. Meanwhile, the former two compositions generally had a more complex phase constitution, containing the tungsten–bronze phase combined with some unknown phase, and a relatively small temperature coefficient of the dielectric constant in the temperature range of 20 to 85 °C could be achieved in these two compositions.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 1 , January 2000 , pp. 125 - 129
Copyright
Copyright © Materials Research Society 2000

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References

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