Use of lead-containing piezoelectric components in electrical and electronic devices has been banned on the EU market since July 1st, 2006. Development of lead-free high performance piezoelectric materials to meet the strong market demand is therefore imperative. In this paper, we report a systematic study on the structural, dielectric and ferroelectric properties of one class of lead-free piezoelectric materials, Ba1-x-yCaxSryTiO3 (x = 0-0.4, and y = 0-0.2) ceramics, using techniques such as XRD, SEM, impedance analyzer, and ferroelectric analyzer. It is found that with increasing Sr concentration in Ba1-ySryTiO3 and Ba0.8-ySryCa0.2TiO3, the crystal structure transforms from tetragonal to cubic along with a decreased unit-cell volume. The microstructures of all samples prepared are uniform and dense with the grain size decreasing with Sr content. The Curie temperature decreases faster with Sr and Ca co-doped BaTiO3 than that of Sr or Ca singularly-doped one. Above Curie temperature, a tunability of 31.4% can be achieved at an applied voltage of 30 kV/cm for (Ba0.6Ca0.2Sr0.2TiO3). These properties promise Ba1-x-yCaxSryTiO3 system to be applicable in Pb-free tunable devices.
Published in ECS Journal of Solid State Science and Technology, Volume 1, Issue 2, 2012, pages N29-N32.
©ECS Journal of Solid State Science and Technology 2012, The Electrochemical Society.
© The Electrochemical Society, Inc. 2012. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in ECS Journal of Solid State Science and Technology.
Publisher’s Version: http://dx.doi.orgg/10.1149/2.019202jss
Zhang, Z., Wang, S., Wang, X., & Huang, K. (2012). Characterization of Ba1-x-yCaxSryTiO3 Perovskites as Pb-Free Dielectric Materials. ECS Journal of Solid State Science and Technology, 1 (2), N29 - N32. http://dx.doi.org/10.1149/2.019202jss