Abstract
Structural phase transitions in Pb2LuTaO6 were investigated by means of X-ray powder diffraction, dielectric constant, differential scanning calorimetry, and electric field–polarization hysteresis loops. The basic structure of the antiferroelectric phase has been identified as monoclinic. The paraelectric–antiferroelectric phase transition at TPA = 280 °C on cooling is strongly of first order, which is confirmed by dielectric thermal hysteresis. The antiferroelectric–ferroelectric phase transition at TAF = —20 °C on cooling has been characterized by a step-like anomaly in the dielectric constant, a distinct heat capacity anomaly, and dielectric dispersion in the antiferroelectrically ordered Pb2LuTaO6. At temperature below TAF, the electric field E–polarization P hysteresis loops confirmed ferroelectricity.
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