Table of Contents
Journal of Ceramics
Volume 2013 (2013), Article ID 852867, 6 pages
http://dx.doi.org/10.1155/2013/852867
Research Article

The Effect of Isostatic Pressing on the Dielectric Properties of Screen Printed Ba0.5Sr0.5TiO3 Thick Films

1Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA
2Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China

Received 23 October 2012; Revised 28 February 2013; Accepted 12 March 2013

Academic Editor: Shaomin Liu

Copyright © 2013 Siwei Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ba0.5Sr0.5TiO3 thick films with B2O3–Li2O glass sintering aid were prepared by the screen printing method on Al2O3 substrates. A 200 MPa isostatic pressure was applied to the films before sintering. After being sintered at 950 °C, lower porosity and denser microstructure was obtained compared with the films without isostatic pressing. The dielectric constant and dielectric loss were 238 and 0.0028, respectively. A tunability of 61.7% was obtained for the isostatic pressed films, a 27.8% enhancement compared to unpressurized films. These results suggest that isostatic pressing is an effective way to prepare dielectric thick films with dense microstructure, low dielectric loss, and high tunability.