Abstract
Structural phase transitions in Pb 2 LuTaO 6 were investigated by means of X-ray powder diffraction, dielectric constants 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 T PA = 280°C on cooling is strongly of first order, which is confirmed by dielectric thermal hysteresis. The antiferroelectric-ferroelectric phase transition at T AF = -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 antiierroelectrically ordered Pb 2 LuTaO 6 . At temperature below T AF , the electric field E-polarization P hysteresis loops confirmed ferroelectricity.
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