Abstract
A lead-reduced ternary ferroelectric solid solution system of BiScO3–Pb(Zn1/3Nb2/3)O3–PbTiO3 (BS–PZN–PT) in the form of the ceramic was investigated for its structure and properties in order to develop novel ferroelectric materials with high Curie temperature and good piezoelectric properties. A morphotropic phase boundary region was delimited in this system between rhombohedral and tetragonal phases. The Curie temperature TC of this ternary system varied from 321°C to 131°C and the coercive fields EC from 24.6kV/cm to 8.62kV/cm. The piezoelectric coefficient d33 varies in the range of 100–320pC/N with increasing PZN content. Those compositions within the MPB region possess good comprehensive piezoelectric properties, for example, d33 and TC of compositions with 0.32BS–0.15PZN–0.53PT, 0.34BS–0.15PZN–0.51PT and 0.28BS–0.30PZN–0.42PT are 313pC/N and 319°C, 300pC/N and 304°C, 320pC/N, and 236°C, respectively. The high TC and d33 make it a promising material for high-powder ultrasound transducers for use over a wide temperature range.
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