Enhanced electrical properties by AC poling of relaxor-Pb(Zr,Ti)O-3 single crystals manufactured by the solid state crystal growth method
JAPANESE JOURNAL OF APPLIED PHYSICS(2023)
Abstract
An exceptionally large free dielectric permittivity of 14200, piezoelectric coefficient (d (33)) of 4800 pC/N and calculated electromechanical coupling factor k (33) of 95.7% were obtained from Pb(Mg1/3Nb2/3)O-3 (PMN) - Pb(Zr,Ti)O-3 (PZT) single crystals (SCs) under AC poling (ACP). The PMN -0.3PZT SCs grown by a solid-state crystal growth (SSCG) method with high composition uniformity showed a phase change temperature of 57 & DEG;C-72 & DEG;C and Curie temperature T (c) of 140 & DEG;C. The measured d (33) of 250 pC/N was obtained after a heat treatment at 250 & DEG;C, which is 110 & DEG;C higher than the T (c) of the SC. Microstructural observations revealed that the ACP SC showed a different 109 & DEG; domain wall layers morphology due to the presence of some pores, which is dissimilar to the Bridgman ACP relaxor-PbTiO3 SCs. These outstanding piezoelectric properties, heat durability, lower acoustic impedance, and better machinability of ACP SSCG SCs are promising for future piezoelectric device applications.
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Key words
piezoelectric materials, single crystals, solid state crystal growth, microstructure, piezoelectric properties, dielectric properties, AC poling
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