Mossbauer effect in ferroelectric BaTiO3

Bhide, V. G. ; Multani, M. S. (1965) Mossbauer effect in ferroelectric BaTiO3 Physical Review, 139 (6A). A1983-A1990. ISSN 0031-899X

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The mossbauer effect for Fe57m in the BaTiO3 lattice has been studied from 300 to 1200°K with particular emphasis on the region near the Curie temperature. The mossbauer probe seems to serve as a useful tool for the study of ferroelectrics. The electric-field gradient as seen by the probe at room temperature is -0.52×1014 esu cm-3 and is closely proportional to Ps2 as the spontaneous polarization Ps varies with temperature. The strength of the resonant absorption was also determined as a function of temperature in the region above Tc. Much above Tc these measurements are compatible with a Debye temperature of 450°K. However, as the Curie temperature is approached, the lamb-mossbauer factor decreases appreciably. These results are discussed in the light of Cochran's theory of ferroelectricity. From the isomer shift at room temperature (0.50±0.02 mm/sec with respect to 310 stainless steel) the over-all degree of ionicity is estimated to be 60±20%. The temperature shift shows a discontinuity at Tc and is attributed to the change in covalent binding.

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Source:Copyright of this article belongs to American Physical Society.
ID Code:5012
Deposited On:18 Oct 2010 05:33
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