Effect of particle size and ZnO addition on microwave dielectric properties of nanocrystalline (Zr_0.8Sn_0.2) TiO₄ ceramics

Authors: Pamu, D.¹; Rao, G. Lakshmi Narayana¹; Raju, K.C. James²

Source: Advances in Applied Ceramics, Volume 106, Number 4, August 2007 , pp. 202-208(7)

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Abstract:

Polycrystalline samples of (Zr_0.8Sn_0.2)TiO₄ have been synthesised by solid state reaction method. The effects of ball milling and the addition of ZnO (1–2.5 wt-%) on the microwave dielectric properties of (Zr_0.8Sn_0.2)TiO₄ ceramics are investigated. As the ball milling time increases, the density of the (Zr_0.8Sn_0.2)TiO₄ ceramics increases. The influence of ZnO as a sintering aid on the sintering temperature of (Zr_0.8Sn_0.2)TiO₄ is also studied. As the weight percentage of ZnO increases, the density increases up to 1.5 wt-% of ZnO and thereafter it starts decreasing. The dielectric constant ε_r and the product of quality factor Q and resonant frequency f_o of TE₀₁ _δ mode (Qxf_o) followed the same trend with increasing density, irrespective of whether the density increased with ball milling time or by addition of ZnO. The value of Qxf_o is found to increase with increasing grain size. The microwave dielectric constant and the Qxf_o values were respectively ranged from 32 to 39.3 and from 32 000 to 49 600 at 10.5 GHz for (Zr_0.8Sn_0.2)TiO₄ ceramics. Furthermore, the influence of the processing parameters on the microwave dielectric properties of (Zr_0.8Sn_0.2)TiO₄ is discussed.

Keywords: NANOCRYSTALLINE; ZST; MICROWAVE DIELECTRIC PROPERTIES

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174367607X178157

Affiliations: 1: School of Physics, University of Hyderabad, Hyderabad 500 046, India 2: School of Physics, University of Hyderabad, Hyderabad 500 046, India., Email: kcjrsp@uohyd.ernet.in

Publication date: 2007-08-01

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