Abstract
Abstract The polar low-temperature phase of weakly doped KTa1-xNbxO3 with x ≥ 0.012 seems to be ferroelectric as shown by Raman data, but simultaneously exhibits glass-like disorder according to recent X-ray studies. Very probably this is due to the occurrence of a nanometric domain state upon cooling in random microstress fields produced by lattice mismatch of the Nb5+ ions. Sub-exponential decrease of the excess permittivity is observed on a sample with x = 0.017 after quenching to below Tc = 27.8 K. This indicates relaxational growth of the quadrupolar domains towards long-range order under constraint of random fields in agreement with theoretical predictions.
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