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Structure of the noncubic phase in the ferroelectric state of Pr-substituted SrTiO3

Physical Review B 79(14): -

Autoren/Herausgeber: Garg R
Senyshyn A
Boysen H
Ranjan R
Erschienen: 2009

Sr1-xPrxTiO3 has recently been shown to exhibit ferroelectricity at room temperature. In this paper powder x-ray and neutron-diffraction patterns of this system at room temperature have been analyzed to show that the system exhibits cubic (Pm-3m) structure for x <= 0.05 and tetragonal (I4/mcm) for x>0.05. The redundancy of the noncentrosymmetric structural model (I4cm) in the ferroelectric state suggests the absence of long-range ordered ferroelectric domains and supports the relaxor ferroelectric model for this system.