Abstract
Rhombohedral Ba(Ti 0.92 Zr0.08)O₃ 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 0.92 Zr 0.08 )O₃ single crystals have an electromechanical coupling factor (k 33 ) higher than 0.85, piezoelectric charge constant (d 33 ) of about 950 [pC/N], and piezoelectric voltage constant (g 33 ) higher than 40 [x10 -3 Vm/N]. Especially the d 33 of (001) Ba(Ti 0.92 Zr 0.08 )O₃ single crystals was by about six times higher than that of their ceramics. Because their electromechanical coupling factor (k 33 ) and piezoelectric voltage constant (d 33 , g 33 ) are higher than those of soft PZT ceramics, it is expected that rhombohedral (001) Ba(Ti 0.92 Zr 0.08 )O₃ single crystals can be used as “lead-free” piezoelectric materials in many piezoelectric applications such as actuator, sensor, and transducer.
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