Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 8, Pages 6446-6452Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.02.059
Keywords
Ceramics; Structural; Piezoelectric materials; Na0.5Bi4.5Ti4O15-Bi4Ti3O12
Categories
Funding
- National Natural Science Foundation of China [51562014, 51262009, 51602135]
- Natural Science Foundation of Jiangxi, China [20133ACB20002, 20142BAB216009]
- Foundation Provincial Department of Education [GJJ150931, GJJ150911]
- innovation training program of Jingdezhen Ceramic Institute [212050-008]
- Foundation of Training Academic and Technical Leaders for Main Majors of Jiangxi [2010DD00800]
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New lead-free inter-growth piezoelectric ceramics, Na0.5Bi8.3-x LaxTi7O27 (NBT-BIT-xLa, 0.00 <= x <= 1.00), were prepared by the conventional solid-state method. Structural and electrical properties of NBT-BIT-xLa were studied. All the NBT-BIT-xLa samples exhibited a single inter-growth structured phase. XRD and Raman spectroscopy revealed a reduced orthorhombicity, which strongly supports the variation of dielectric and ferroelectric properties. Plate-like grains were found to decrease with the increasing x contents. Impedance spectra analysis indicated that oxygen vacancy defects dominated the contributions to the electrical conductivity. The increased activation energies for dc conductivity evidenced the reduction of oxygen vacancy concentration after La substitution, inducing the enhancement in piezoelectric constant (d(33)) and remanent polarization (2P(r)). The studies of thermal depoling indicated that the optimal d(33) of NBT-BIT-0.50La ceramics still remained 22 pC/N at 500 degrees C, implying that this ceramics could be potentially applied into high temperature devices.
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