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Investigation of tetragonal distortion in the $PbTiO_3$ – $BiFeO_3$ system by high-temperature x-ray diffraction

Sunder, Sai VVSS and Halliyal, A and Umarji, AM (1995) Investigation of tetragonal distortion in the $PbTiO_3$ – $BiFeO_3$ system by high-temperature x-ray diffraction. In: Journal of Materials Research, 10 (5). pp. 1301-1306.

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Compositions in the $(Pb_{1-x}Bi_x)$ $(Ti_{1-x}Fe_x)O_3$ solid solution system for x $\leq$ 0.7 show unusually large tetragonal distortion. High-temperature x-ray diffraction was used to study the tetragonal distortion as a function of temperature (25–700 $^oC$) for compositions (x - 0–0.7) using powders prepared by solid-state reaction in the above system. Large changes in the lattice parameters were observed over a narrow temperature range near Curie temperature $(T_C)$ for compositions near the morphotropic phase boundary (MPB)x $\simeq$ 0.7). Compositions near MPB showed a c/a ratio of 1.18 at room temperature. Polar plots of lattice constants at different temperatures indicated strong anisotropic thermal expansion with zero thermal expansion along the [201] direction.

Item Type: Journal Article
Publication: Journal of Materials Research
Publisher: Materials Research Society
Additional Information: The copright belongs to Materials Research Society.
Keywords: Ceramics;Crystallographic structure;X-ray diffraction (XRD) Materials;PbTiO3-BiFeO3
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 11 Jun 2006
Last Modified: 11 Aug 2011 13:25
URI: http://eprints.iisc.ac.in/id/eprint/7559

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