Abstract
The temperature dependence of the electric-field gradient of 111Cd in single crystalline LiTaO3 was studied from room temperature to 1040 K in the ferroelectric and paraelectric phases. The data taken at room temperature show unambiguously the presence of two quadrupole interaction frequencies, νQ1=230 MHz and νQ2=242 MHz, with nonzero asymmetry parameters, while above the Curie temperature (TC=878 K) the data are well described by a unique frequency. The electric field gradient shows a usual temperature dependence, increasing aproximately in a linear fashion until TC and then decreasing faster. The initial increase is explained mostly by the lattice expansion, while above TC it is necessary to consider Li and O displacements.
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Marques, J., Kling, A., de Jesus, C. et al. Electric field gradients at the 111In site in the ferroelectric and paraelectric phases of LiTaO3 . Hyperfine Interactions 120, 485–489 (1999). https://doi.org/10.1023/A:1017013910162
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DOI: https://doi.org/10.1023/A:1017013910162