期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 29, 期 14, 页码 3045-3052出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2009.04.026
关键词
Grain growth; Microstructure-final; Piezoelectric properties; Perovskites; Actuators
资金
- CICYT [MAT2007-66845-C02-01]
- MAGIN [PIF2006-60f0121]
- Junta de Ampliacion de Estudios [JAEDOC087]
The effects of ZnO addition on structure, microstructure and dielectric properties of (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O-3 ceramics (KNL-NTS) are investigated. Doping provokes phase segregation, evidenced by the appearance of different types of grains and a tetragonal tungsten-bronze secondary phase at high ZnO doping levels. A clear increase of ferroelectric-paraelectric and orthorhombic-to-tetragonal phase transition temperatures with ZnO content is observed. This produces a reduction of the room temperature piezoelectric constants due to the reduction of the tetragonality (cla) ratio of the KNL-NTS structure. (C) 2009 Elsevier Ltd. All rights reserved.
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