Temperature-dependence of the hyperfine interaction in the cubic phase of BaHfO₃
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1991
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American Physical Society
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Abstract
The temperature dependence of the hyperfine interaction in the paraelectric phase of BaHfO₃ in the temperature range from liquid-nitrogen temperature to 1350 K has been studied. The experimental results show an Abragam-Pound mechanism for the attenuation of the angular correlation. In this cubic structure the attenuation would be consistent with a relaxation mechanism that involves O-ion hopping between vacant sites in the lattice. Using the point-charge model for the estimation of the electric field gradient produced by an O vacancy in the coordination sphere of the probe ion, the process is characterized by a correlation time τ_(c) = 12 ± 1 ps at RT.
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1991 The American Physical Society.
We thank Dr. M. Benyacar for the x-ray analysis and interesting comments, Dr. M. Weissmann for fruitful discussion, and Lic. Griselda Polla for the DTG analysis. two of us (A.L.G.) and (A.M.R.) acknowledge CONICET for partial financial support.