The first evidence of two phase transitions in PbZrO3crystals derived from simultaneous raman and dielectric measurements

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Abstract
The temperature dependence of Raman scattering near the phase transition points between antiferroelectric orthorhombic(Aa), ferroelectric rhombohedral (FR) and paraelectric cubic (PC) phases was investigated in PbZrO3 crystals. The measurements were carried out with simultaneous observations of the electric permittivity along the [111] direction. The ferroelectric nature of the intermediate phase had previously been observed by the hysteresis loop and pyroelectric tests. The evolution of the Raman spectra from Aa to Pc through the FR phase is reported. The main modification of the Raman spectrum takes place at the temperature at which ε(T) begins to exhibit significant variations.