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  4. Electrical and structural characterization of (KxNa1-x)NbO3 ceramics modified with Li and Ta
 
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Electrical and structural characterization of (KxNa1-x)NbO3 ceramics modified with Li and Ta

Citation Link: https://doi.org/10.15480/882.1034
Publikationstyp
Working Paper
Date Issued
2011
Sprache
English
Author(s)
Mgbemere, Henry Ekene  
Hinterstein, Jan Manuel  
Schneider, Gerold A.  
Institut
Keramische Hochleistungswerkstoffe M-9  
TORE-DOI
10.15480/882.1034
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/1036
Citation
Journal of applied crystallography ; 44.2011, pp, 1080-1089
(KxNa1-x)NbO3 ceramics modified with Li+ and Ta5+ have been produced using the mixed-oxide synthesis method. Synchrotron X-ray diffraction measurements were made on the samples from 12K to temperatures above their ferroelectric-paraelectric transition points with 10K measurement steps. Rietveld refinement using FULLPROF suite was used to refine the patterns. Depending on the composition and temperature, rhomhohedral phases, orthorhombic phases, tetragonal phases, cubic phases and two-phase mixtures were obtained. R3c (161), Amm2 (38), P4mm (99), (221) space groups and their combinations were used to refine the rhombohedral, orthorhombic, tetragonal, cubic and the mixed phases respectively. Li+ addition suppressed the formation of the rhombohedral low temperature phase and increased the Curie temperature. This is attributed to size difference in ionic radii of the A-site elements which leads to increased atomic polarizability and increased interaction with the B-site element. Li+ and Ta5+ co-doping led to a wide temperature range of phase coexistence between the orthorhombic and tetragonal phase. Electrical characterizations by dielectric and hysteresis measurements were used to compare with the results from the structural studies.
Subjects
(KxNa1-x)NbO3
Ferroelektrische Keramik
die Synchrotronstrahlung
(KxNa1-x)NbO3
ferroelectric ceramics
phase transition
synchrotron radiation
Lizenz
http://doku.b.tu-harburg.de/doku/lic_ohne_pod.php
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