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Dielectric, anelastic and ^139La NMR relaxation measurements have been madeon the relaxor ferroelectric Pb(1-3x/2)La(x)Zr(0.2)Ti(0.8)O(3) (PLZT) with x =0.22. The dielectric susceptibility exihibits the frequency dispersive maximumdue to the freezing of the polar degrees of freedom around T ~250 K. Theanelastic and especially NMR relaxation, besides this maximum, indicate anintense and broad component at lower temperatures, attributed to rotationalmodes of the O octahedra, weakly coupled to the polar modes. It is discussedwhy such short range rotational instabilities, known to occur in the Zr-richrhombohedral region of the PLZT phase diagram, might appear also in the Ti-richregion.Comment: submitted to Phys. Rev. B, 9 pages, 10 figure

physical review. b, condensed matter and materials physics

Polar and nonpolar atomic motions in the relaxor ferroelectric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Pb</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mn>3</mml:mn><mml:mi>x</mml:mi><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Zr</mml:mi><mml:mn>0.2</mml:mn></mml:msub><…

Polar and nonpolar atomic motions in the relaxor ferroelectricPb1−3x∕2LaxZr0.2<…