Mossbauer effect for Fe57 in ferroelectric lead titanate

Bhide, V. G. ; Hegde, M. S. (1972) Mossbauer effect for Fe57 in ferroelectric lead titanate Physical Review B, 5 (9). pp. 3488-3499. ISSN 0163-1829

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Mossbauer effect for Fe57 in ferroelectric PbTiO3 has been investigated over the temperature range 300-1100°K. The quadrupole interaction in the ferroelectric phase remains nearly saturated up to 320°C, beyond which it decreases gradually to disappear at and above the transition temperature TC=(480±2) °C. The ratio of the quadrupole interaction sensed by the 3/2 state of Fe57 nucleus in PbTiO3 to that in BaTiO3 at room temperature is 1.41 ± 0.04, in good agreement with the value 1.46 ± 0.07 obtained through perturbed Sc44 γ-γangular-correlation studies by hass and glass. The numerical value of the electric field gradient, as also that of isomer shift at room temperature, indicates that this lattice is more covalent than BaTiO3. Both the center shift and the area under resonance show anomalous temperature variation in the vicinity of the transition temperature. Analysis of the temperature variation of these parameters suggests that the debye temperature of the lattice decreases considerably on crossing the transition temperature. Analytical form of the lamb-mossbauer factor in the presence of the cochran type of soft mode has been derived. Computer fitting of the theoretical value of the lamb-mossbauer factor at various temperatures normalized to that at TC, with the corressponding normalized areas under resonance, has brought out the essential validity of the suggested temperature variation of the soft mode.

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Deposited On:18 Oct 2010 05:30
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