Morphotropic Phase Boundary and Electric Properties of Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3–BaTiO3–SrTiO3 Ceramics
Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3–BaTiO3–SrTiO3 (NBT–KBT–BT–ST) lead-free piezoelectric ceramics with the compositions of (1–2x)(0.8NBT–0.2KBT)–x(0.94NBT–0.06BT)–x(0.74NBT–0.26ST)(x
= 0.10, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45) were fabricated by a solid state reaction method. The structure and electrical properties for NBT–KBT–BT–ST samples were investigated. The morphotropic phase boundary (MPB) between the rhombohedral and tetragonal phases was identified
in all the samples. The results demonstrate that such ceramic systems near the MPB exhibit superior electrical properties. The piezoelectric constant d33, electromechanical planar coupling factor kp and remanent polarization Pr firstly increased and then decreased
with the increase of x. The optimum electric properties (d33 = 210 pC/N, kp = 0.319, Pr= 39.3 μC/cm2, Ec = 20.2 kV/cm) could be obtained for a composition with x = 0.35. It is suggested that NBT–KBT–BT–ST with the
composition (x = 0.35) could be a candidate material for lead-free applications. Therefore, the MPB linear combination rule could be used to search for the composition near MPB with the excellent properties of NBT–KBT– BT–ST ceramics.
Keywords: electric properties; lead-free piezoelectric ceramics; morphotropic phase boundary
Document Type: Research Article
Affiliations: Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen 333001, Jiangxi, China
Publication date: 01 November 2012
- Journal of the Chinese Ceramic Society (JCCS), published in Chinese and in English, is a comprehensive monthly periodical focused on the fields of inorganic and non-metallic materials. The main purpose of the JCCS is to report the latest creative achievements in research, production and design for ceramics, glass, cementing materials, refractory, artificial crystals and other non-metallic materials. JCCS is regarded as an important journal in inorganic and non-metallic materials sciences in China and has been awarded by China Association for Science and Technology. The full-text of papers in JCCS is also published by CNKI (China National Knowledge Infrastructure). JCCS is indexed in EI Compendex, CA( Chemical Abstracts) ,SA and Ж and more than 20 databases.
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