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Crystal Structure–microwave Dielectric Property Relations in R2BaZnO5 (R= Sm, Eu, Gd, Dy, Ho, Er, and Tm) Ceramics

Published online by Cambridge University Press:  31 January 2011

Akinori Kan  and
Hirotaka Ogawa
Akinori Kan
Affiliation:
Faculty of Science and Technology, Meijo University, 1–501 Shiogamaguchi, Tempaku-ku, Nagoya 468–8502, Japan
Hirotaka Ogawa
Affiliation:
Faculty of Science and Technology, Meijo University, 1–501 Shiogamaguchi, Tempaku-ku, Nagoya 468–8502, Japan
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Abstract

R2BaZnO5 (R = Sm, Eu, Gd, Dy, Ho, Er, and Tm) were synthesized, and the effects of the differences in ionic radii of R ions on the microwave dielectric properties and crystal structure have been investigated by using x-ray powder diffraction. It was shown that the R2BaZnO5compounds have an orthorhombic crystal structure with Pnma (No. 62) and the lattice parameters of the samples increase linearly with the increase in the ionic radii of the R ions. The dielectric constants (εr) of R2BaZnO5sintered at the optimum temperatures vary linearly from 16.1 to 19.3, suggesting that these variations in εr are the result of the differences in the ionic polarizabilities of R ions. Moreover, it is suggested that the variations in the valences of R ions determined by using bond valence sum may exert an influence on quality factor (Qf ), because the values of valences of R ions in R(1)O7 polyhedra and Qf exhibit similar tendencies with changes in the ionic radii of R ions. In the R2O3–BaO–ZnO system, Dy2BaZnO5showed the appropriate microwave dielectric properties: εr = 17.1, Qf = 29669 GHz, and τf = −1.5 ppm/°C.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 7 , July 2002 , pp. 1803 - 1807
Copyright
Copyright © Materials Research Society 2002

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