Ferroelectric precursor behavior of highly cation-ordered PbSc0.5Ta0.5O3 detected by acoustic emission: Tweed and polar nanoregions

摘要: Highly ordered ferroelectric PbSc0.5 Ta 0.5O3 crystals were studied by acoustic emission over a wide temperature range. Acoustic was found at three characteristic temperatures: 330, 409, and ≈600 K, which are close to those, known from the same disordered crystals, containing polar nanoregions. The microstructure in our contains structural “tweed” rather than coincidence of temperatures points towards relationship between nanoregions “tweed.” Under electric field, these shift similar “critical end point” behavior. obtained data prove that detects signals wider parameter space previously expected.