Giant piezodielectric effect near the polymorphic phase boundary of perovskites near resonant frequencies

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Summary Traditional enhancement of piezoelectric properties via morphotropic phase boundary (MPB) engineering or the incorporation of relaxor ferroelectric (FE) materials faces limitations, including a reduced Curie temperature (TC) and permittivity saturation. This article introduces a piezodielectric effect that capitalizes on the resonant frequency of common piezoelectric materials with dual-phase coexistence. This approach has yielded an extraordinary permittivity increase exceeding 1,000% at FE–FE phase transition temperature on permittivity-temperature curves. This method of magnifying the FE–FE permittivity shoulder provides a foundation for the precise determination of the MPB position on the phase diagram. In addition, by decoupling permittivity enhancement from TC reduction, we achieved a colossal relative permittivity (>40,000) and a calculated piezoelectric coefficient (>5,000 pC/N) near room temperature alongside a relatively high TC (>300°C) in relaxor ferroelectric ceramics. This breakthrough paves the way for amplifying dielectric and piezoelectric properties, offering significant benefits for the performance of transducers and sensors.