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http://dx.doi.org/10.4191/kcers.2014.51.6.623

"Lead-free" Piezoelectric Ba(Ti0.94Zr0.06)O3 Single Crystals with Electromechanical Coupling Factor (k33) Higher Than 0.8  

Lee, Jong-Yeb (Ceracomp Co., Ltd.)
Oh, Hyun-Taek (Ceracomp Co., Ltd.)
Lee, Ho-Yong (Department of Materials Science and Engineering, Sunmoon University)
Publication Information
Journal of the Korean Ceramic Society / v.51, no.6, 2014 , pp. 623-628 More about this Journal
Abstract
Orthorhombic $Ba(Ti_{0.94}Zr_{0.06})O_3$ single crystals are fabricated using the cost-effective solid-state single crystal growth (SSCG) method; their dielectric and piezoelectric properties are also characterized. Measurements show that (001) $Ba(Ti_{0.94}Zr_{0.06})O_3$ single crystals have an electromechanical coupling factor ($k_{33}$) higher than 0.83, piezoelectric charge constant ($d_{33}$) of about 400 [pC/N], and piezoelectric voltage constant ($g_{33}$) higher than 50 [${\times}10^{-3}Vm/N$]. The transition temperature ($T_{OT}$) of the (001) $Ba(Ti_{0.94}Zr_{0.06})O_3$ single crystals between orthorhombic and tetragonal phases is also observed to be about $61^{\circ}C$. Because their electromechanical coupling factor ($k_{33}$) and piezoelectric voltage constant ($g_{33}$) are higher than those of soft PZT ceramics, it is expected that (001) $Ba(Ti_{0.94}Zr_{0.06})O_3$ single crystals can be used as "lead-free" piezoelectric materials in many piezoelectric applications.
Keywords
Piezoelectric; Lead-free; Single crystals; Electromechanical coupling factor;
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