Scandium modified lead magnesium niobate-lead titanate single crystals for high temperature and high power applications

Within the morphotropic phase boundary region, 0.39PSN-0.13PMN-0.48PT crystals exhibit excellent properties. The dielectric response of poled 〈001〉-oriented 0.39PSN-0.13PMN-0.48PT crystal plates displays non-relaxor behavior with Curie and depolarization temperatures of about 230 °C and 199 °C, respectively, exhibiting high temperature stability of the ferroelectric phase. The saturated polarization-electric field loop of the same plate manifests the switching of domains, with the coercive field of approximately 5.6 kV/cm, indicating stable piezoelectric properties. The out of plane and in plane domain configurations exhibit obvious domain walls. The typical butterfly strain-electric field curve presents a large peak to peak strain value of about 0.59%. The piezoelectric constant is calculated to be about 1670 pC/N from the unipolar stain-electric field curve.