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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) November 24, 2010

Temperature-dependent synchrotron powder diffraction phase studies of (K0.37Na0.52Li0.03)(Nb0.87Ta0.1Sb0.03)O3 ferroelectric ceramics

  • Henry Mgbemere , Rodrigo P. Fernandes , Manuel Hinterstein and Gerold A. Schneider

Abstract

Temperature-dependent synchrotron powder diffraction measurements have been performed on lead-free ferroelectric (K0.37Na0.52Li0.03)(Nb0.87Ta0.1Sb0.03)O3 ceäramics. The measurement was performed from 20 °C to 400 °C with 20 °C steps. The diffraction patterns showed the existence of two phases from 20 °C to 180 °C while the ferroelectric to paraelectric phase transition occurred between 340 °C and 360 °C. Rietveld refinement using the Fullprof software was employed and the two-phase region was refined using a combination of the orthorhombic phase with space group Amm2 (38) and the tetragonal phase with space group P4mm (99) from 20 °C to 180 °C. The tetragonal phase was used for the refinement up to 340 °C while the cubic phase was refined with space group Pm-3m (221). Good refinement structure parameters were obtained for all temperatures with the average G.O.F being approximately 4.0. Information about the cell parameters and weight fraction of the phases were obtained as a function of temperature.


* Correspondence address: Hamburg University of Technology, Institute of Advanced Ceramics, Denickestraße 15, 21073 Hamburg, Deutschland,

Published Online: 2010-11-24
Published in Print: 2011-02

© by Oldenbourg Wissenschaftsverlag, Hamburg, Germany

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