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

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Zeitschrift für Kristallographie - Crystalline Materials

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

Henry Mgbemere* / Rodrigo P. Fernandes1 / Manuel Hinterstein2 / Gerold A. Schneider3

1 Hamburg University of Technology, Institute of Advanced Ceramics, Hamburg, Deutschland

2 TU Dresden, Institute for Complex Materials, Dresden, Deutschland

3 Hamburg University of Technology, Institute of Advanced Ceramics, Hamburg, Deutschland

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

Citation Information: Zeitschrift für Kristallographie Crystalline Materials. Volume 226, Issue 2, Pages 138–144, ISSN (Print) 0044-2968, DOI: 10.1524/zkri.2011.1298, November 2010

Publication History

Published Online:
2010-11-24

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.

Keywords: Synchrotron X-ray; Rietveld refinement; Lead-free ferroelectric ceramics; Potassium sodium niobate; High temperature

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[3]
Henry E. Mgbemere, Manuel Hinterstein, Gerold A. Schneider, and W. K. Wong-Ng
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Ezgi D. Yilmaz, Henry E. Mgbemere, Hüseyin Özcoban, Rodrigo P. Fernandes, and Gerold A. Schneider
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