The electric field gradients (ms) of "'Cd at substilutional sites in binary oxides of different crystal Stmctms obtained in perturbed angular mrrelatiou (PAC) experiments are collected and mmpared to point charge model.(Pc~) calculations. The ermr of the calculated EFGS is estimated from the experimental emor m the crystal p-.The PCM seems to be a good approximation'for oxides with bond lengths exceeding d ^I 2.1 A and here the theoretical shieldingofactor yoo can be used; The application of radially dependent shielding fanors for d <>.I A where covalent bonding prevails is discussed.
Perturbed-angular-correlation (PAC) measurements with 111In(EC)111Cd probes, implanted at 400 keV into poly- or mono-crystalline Cr2O3, have been carried out as a function of temperature (290-1370 K). Two different electric-field gradients (e.f.g.'s) with identical orientations in the lattice have been found. Their temperature-dependent variations can be well described by a dynamical model which we propose to be connected with a hole trapping at a next-neighbour Cr ion.
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