Titel: Temperature-dependent synchrotron powder diffraction phase studies of (K0.37Na0.52Li0.03)(Nb0.87Ta0.1Sb0.03)O3 ferroelectric ceramics
Sprache: Englisch
Autor/Autorin: Mgbemere, Henry Ekene
Keramische Hochleistungswerkstoffe M-9
Schlagwörter: Synchrotron;blei-frei keramik, (KxNa1-x)NbO3;Synchrotron XRD;Rietveld refinement;Lead-free ferroelectric ceramics;Potassium sodium niobate
Erscheinungsdatum: 2011
Quellenangabe: Z. Kristallogr. 226 (2011) 138-144
Zusammenfassung (englisch): Temperature-dependent synchrotron powder diffraction measurements have been performed on leadfree ferroelectric (K0.37Na0.52Li0.03)(Nb0.87Ta0.1Sb0.03)O3 ceramics. 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
URI: http://tubdok.tub.tuhh.de/handle/11420/1037
URN: urn:nbn:de:gbv:830-tubdok-11304
DOI: 10.15480/882.1035
Institut: Keramische Hochleistungswerkstoffe M-9
Advanced Ceramics M-9
Dokumenttyp: ResearchPaper
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