Mössbauer-Effect Studies of the Phase Transitions in Antiferroelectric PbZrO3 and Ferroelectric PbTi0.02Zr0.8O3

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Abstract
The Mössbauer spectra were studied for the antiferroelectric compound PbZrO3 and for the closely related ferroelectric PbTi0.2Zr0.8O3. In both cases, a substitution of 5‐mol% BiFeO3 was made to permit the Mössbauer measurements. Little difference was found in the isomer shift in these compounds, whether they were in the ferroelectric, antiferroelectric, or cubic state, indicating that the bonding character is not affected by the transitions among the states. There was a pronounced and approximately equivalent dip in the recoil‐free fraction at the Curie points of both the antiferroelectric and ferroelectric materials, associated with a low‐frequency lattice mode at the Brillouin‐zone boundary.