Evidence for MB and MC phases in the morphotropic phase boundary region of (1-x)[Pb(Mg1/3Nb2/3)O3]-xPbTiO3: A Rietveld study

By A. Singh, D. Pandey. 2002

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We present here the results of the room-temperature dielectric measurements and Rietveld analysis of the powder x-ray diffraction data on $(1\ensuremath{-}x)[\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}]\ensuremath{-}x{\mathrm{PbTiO}}_{3}(\mathrm{PMN}\ensuremath{-}x\mathrm{PT})$ in the composition range $0.20l~xl~0.45$ to show that the morphotropic phase boundary region contains two monoclinic phases with space groups Cm (or ${M}_{B}$ type) and Pm (or ${M}_{C}$ type) stable in the composition ranges $0.27l~xl~0.30$ and $0.31l~xl~0.34,$ respectively. The structure of $\mathrm{PMN}\ensuremath{-}x\mathrm{PT}$ in the composition ranges $0l~xl~0.26$ and $0.35l~xl~1$ is found to be rhombohedral (R3m) and tetragonal (P4mm), respectively. These results are compared with the predictions of Vanderbilt Cohen's theory.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

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