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Dependence of dielectric properties on structural characteristics of (Zn1/3A2/3)0.5 (Ti1−xBx)0.5O2 (A = Nb5+, Ta5+, B = Ge4+, Sn4+) ceramics at microwave frequencies

✍ Scribed by Eung Soo Kim; Seock No Seo

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
512 KB
Volume
30
Category
Article
ISSN
0955-2219

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✦ Synopsis

The effects of structural characteristics on the dielectric properties of (Zn 1/3 A 2/3 ) 0.5 (Ti 1-x B x ) 0.5 O 2 (A = Nb 5+ , Ta 5+ , B = Ge 4+ , Sn 4+ ) (0.1 ≤ x ≤ 0.3) ceramics were investigated at microwave frequency. The sintered specimens showed solid solutions with a tetragonal rutile structure within the solid solution range of compositions. With an increase of BO 2 , the temperature coefficient of resonant frequency (TCF) and dielectric constant (K) decreased with a decrease of oxygen octahedral distortion and dielectric polarizabilites, respectively. However, the quality factor (Qf) of the sintered specimens was increased with BO 2 due to the reduction of Ti 4+ ions. The Qf value of the specimens with A = Ta was higher than that of the specimens with A = Nb.

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