期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 602, 期 -, 页码 285-289出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.02.185
关键词
Piezoceramics; Sintering; Ferroelectric properties; Piezoelectricity
资金
- University of Kashan
- National Research Foundation of Korea (NRF) [2013R1A1A2058917]
- National Research Foundation of Korea [2013R1A1A2058917] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Lead-free 0.96K(0.5)Na(0.5)NbO(3)-0.04LiTaO(3) ceramics modified with different amounts of SrTiO3 ( ST) from zero to 10 mol% were prepared by normal sintering. It was found that ST modification changed the crystal structure from orthorhombic to tetragonal and for ceramics with 10 mol% ST, pseudocubic structure was formed which was nonpolar. Investigation of bipolar strain revealed that with increasing ST content to 7.5 mol%, the negative strain decreased. This observation was attributed to the existence of nonpolar regions with local composition close to that of the ceramic containing 10 mol% ST. This phenomenon was accompanied with strain enhancement in unipolar strain curve because of the contribution of strain due to electric field-induced transition from nonpolar to ferroelectric phase, in addition to electric field induced strain. (C) 2014 Elsevier B.V. All rights reserved.
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