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• W2075517070 abstract "Low-temperature ordering transitions in polycrystalline high temperature conductors (Dy1 − xCax)2Ti2O7 − δ (x = 0, 0.1) prepared using co-precipitation, mechanical activation and solid-state reactions at 1400 or 1600 °C have been studied by impedance spectroscopy at low frequencies and thermal mechanical analysis (TMA). The dielectric permittivity and loss tangent of the ceramics obtained have been measured as a function of temperature at low frequencies (0.5−500 Hz). The results provide evidence for the relaxation of point defects, most likely oxygen vacancies, at 500−600 °C and an antiferroelectric low-temperature phase transition of the second order, associated with re-arrangement process in the oxygen sublattice of pyrochlore structure. The temperature of the antiferroelectric transition is 700 to 800 °C, depending on the synthesis procedure and ceramic composition. Calcium doping of Dy2Ti2O7 leads to the formation of additional oxygen vacancies and, in the case of the samples prepared via co-precipitation, increases the peaks in permittivity due to the relaxation process and ordering transition by three or six times, respectively." @default.
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• W2075517070 date "2011-06-01" @default.
• W2075517070 modified "2023-10-01" @default.
• W2075517070 title "Antiferroelectric phase transition in pyrochlore-like (Dy1− xCax)2Ti2O7−δ (x=0, 0.1) high temperature conductors" @default.
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• W2075517070 doi "https://doi.org/10.1016/j.ssi.2010.06.040" @default.
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