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- W1973672460 abstract "Lanthanum-modified lead zirconate titanate (PLZT) specimens with La contents x between 0 and 5 at. % and a Zr/Ti ratio of 95/5 (PLZT x/95/5) have been investigated by dielectric spectroscopy, Sawyer-Tower polarization (P-E) measurements, and hot-stage transmission electron microscopy (TEM). The dominate phase of PLZT 0/95/5 was found to be isostructural with that of the high-temperature phase of ${mathrm{PbZrO}}_{3}$ (ensuremath{sim}230 ifmmode^circelsetextdegreefi{}C), which is known to be characterized by the presence of 1/2〈110〉 superlattice reflections. An antiferroelectric state was found to be stabilized as the long-range ferroelectric state was disrupted by a small amount of La substitution on the Pb sites. With increasing La content, the antiferroelectric-paraelectric transformation was found to proceed through an incommensurate region. (1/x)〈110〉 incommensurate reflections were observed in selected area electron diffraction (SAED) patterns on cooling below the temperature of the dielectric maximum (${mathit{T}}_{mathrm{max}}$) for PLZT 2/95/5 and 5/95/5. A diffuse incommensurate-commensurate transformation was observed at lower temperatures. It is proposed that incommensuration in antiferroelectric PZT is induced by La impurity content. The incommensuration is believed to arise due to a competition between broken dipolar and antiferroelectric sublattice interactions. A possible transformational sequence is, then, suggested for inhomogeneous antiferroelectrics." @default.
- W1973672460 created "2016-06-24" @default.
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- W1973672460 date "1995-03-01" @default.
- W1973672460 modified "2023-10-08" @default.
- W1973672460 title "Impurity-induced incommensuration in antiferroelectric La-modified lead zirconate titanate" @default.
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- W1973672460 doi "https://doi.org/10.1103/physrevb.51.6261" @default.
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