Abstract
Infrared reflectivity spectra of lead zirconate ceramics were measured in thefrequency region of 20-3000 cm-1 and temperature range from 10 to900 K. The data, extended to lower frequencies by coherent sourcesubmillimetre, time-domain terahertz transmission and microwave dielectricspectroscopies, were fitted with the factorized model of the dielectricfunction. Besides the polar optical phonons, one of which slightly softens inthe vicinity of the antiferroelectric phase transition, a central-mode typedispersion was revealed in the 5-25 cm-1 (1011-1012 Hz) range. This central mode is found to be responsible for the strongdielectric anomaly in the paraelectric phase, whereas the lattice phononcontribution does not exceed ε'~300 in the vicinity of Tc.We attribute the origin of the central mode to the lattice disorder caused bystrongly anharmonic hopping of Pb ions.
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