Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/10667
Title: Phase transitions and electrical characterizations of (K 0.5Na 0.5) 2x(Sr 0.6Ba 0.4) 5-xNb 10O 30 (KNSBN) ceramics with 'unfilled' and 'filled' tetragonal tungsten-bronze (TTB) crystal structure
Authors: Yao, YB
Mak, CL 
Ploss, B
Keywords: Doping
Porosity
Pyroelectricity
Strontium barium niobate
Issue Date: 2012
Publisher: Elsevier Sci Ltd
Source: Journal of the European ceramic society, 2012, v. 32, no. 16, p. 4353-4361 How to cite?
Journal: Journal of the European Ceramic Society 
Abstract: Alkali-doped strontium barium niobate (K 0.5Na 0.5) 2x(Sr 0.6Ba 0.4) 5-xNb 10O 30 (KNSBN) ceramics has been prepared by a conventional solid-state reaction method. The alkali-dopant concentration x has been varied from 0.24 to 1.15 so that the crystal structure was transformed from 'unfilled' to 'filled' tetragonal tungsten-bronze (TTB) structure. Apart from the change in the structural properties, the effects of the alkali-dopants on the phase transition as well as ferroelectric, piezoelectric and pyroelectric properties have also been investigated. Phase transitions have been studied in the temperature range of -200°C to 350°C. The origins of these phase transitions are discussed. The addition of the alkali-dopants enhances the ferroelectric, piezoelectric and pyroelectric properties of the KNSBN ceramics. Alkali-doping also favors abnormal grain growth and thus results in a porous microstructure, which might contribute to the enhancement of the pyroelectric performance.
URI: http://hdl.handle.net/10397/10667
DOI: 10.1016/j.jeurceramsoc.2012.07.034
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