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1 Feb 1999

Volume 74, Issue 5, pp. 635-772

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Rhombohedral superlattice structure and relaxor ferroelectric behavior of (Pb0.70Ba0.30)ZrO3 ceramics

Bhadra P. Pokharel, Rajeev Ranjan, Dhananjai Pandey, V. Siruguri, and S. K. Paranjpe

Appl. Phys. Lett. 74, 756 (1999); http://dx.doi.org/10.1063/1.123113 (3 pages) | Cited 15 times

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Superlattice reflections observed in the neutron powder-diffraction patterns of (Pb0.80Ba0.20)ZrO3 (PBZ20) and (Pb0.70Ba0.30)ZrO3 (PBZ30) are explained in terms of doubled rhombohedral cell (R3c). A Rietveld analysis of the neutron data reveals that the displacements of Pb2+/Ba2+ and Zr4+ decrease with increasing Ba2+ content while the thermal parameter for Pb2+/Ba2+ increases and becomes similar to ferroelectric relaxors. Dielectric studies indeed confirm relaxor behavior in PBZ30 with Vogel–Fulcher type relaxational freezing. © 1999 American Institute of Physics.
Show PACS
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.22.Gm Dielectric loss and relaxation
61.66.Fn Inorganic compounds
77.80.B- Phase transitions and Curie point
77.22.Ch Permittivity (dielectric function)
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