Abstract
The local atomic structure of antiferroelectric and rhombohedral ferroelectric phases of PLZT system has been examined using the atomic pair distribution function (PDF) analysis of the pulsed neutron powder-diffraction data. Atoms were found to be locally displaced from the atomic sites of the average periodic structure by a significant amount, even in PZ. Doping PZ with ferroelectrically active Ti induces displacements of Zr atoms from the central positions resulting in the polarization of some of the ZrO 6octahedra. Doping with La locally inhibits ( Zr Ti ) atoms from being displaced and disrupts ferroelectric order, resulting in relaxor behavior. It is demonstrated that the real atomic structure of PLZT is more complex than implied by crystallographic structure.
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