Journal
CURRENT APPLIED PHYSICS
Volume 14, Issue 3, Pages 331-336Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2013.12.009
Keywords
B0.5Na0.5TiO3-BaZrO3; Dielectric; Ferroelectric; Piezoelectric; Field-induced strain
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) [2011-0030058]
- National Research Foundation of Korea [2011-0030058] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Lead-free piezoelectric ceramics (1 - x)Bi0.5Na0.5TiO3-xBaZrO(3) (BNT-BZ100x, with x = 0-0.10) were prepared using a conventional solid-state reaction method. The crystal structure, microstructure, dielectric, ferroelectric, and piezoelectric properties of BNT-BZ100x ceramics were studied as functions of different BZ content. X-ray diffraction patterns revealed that the BZ completely diffused in the BNT lattice in the studied composition range. An appropriate amount of BZ addition improved the dielectric, ferroelectric, and piezoelectric properties of BNT ceramics. The remanent polarization (P-r) and piezoelectric constant (d(33)) increased from 22 mu C/cm(2) and 60 pC/N for pure BNT to 30 mu C/cm(2) and 112 pC/N for x = 0.040, respectively. In addition, electric field-induced strain was enhanced to its maximum value (S-max = 0.40%) with normalized strain (d(33)* = S-max/E-max = 500 pm/V) at an applied electric field of 8 kV/mm for x = 0.055. The enhanced strain can be attributed to the coexistence of ferroelectric and relaxor ferroelectric phases. (C) 2013 Elsevier B. V. All rights reserved.
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