Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28559
Title: Effects of Ca-dopant on the pyroelectric, piezoelectric and dielectric properties of (Sr 0.6Ba 0.4) 4Na 2Nb 10O 30 ceramics
Authors: Yao, YB
Mak, CL 
Keywords: Dielectric properties
Piezoelectric
Pyroelectric properties
Raman spectroscopy
Sodium strontium barium niobate
Issue Date: 2012
Publisher: Elsevier
Source: Journal of alloys and compounds, 2012, v. 544, p. 87-93 How to cite?
Journal: Journal of alloys and compounds 
Abstract: Calcium-doped sodium strontium barium niobate (SBNN, (Sr 0.6Ba 0.4) 4-xCa xNa 2Nb 10O 30, 0 ≤ x ≤ 0.5) ceramics were prepared by a conventional solid-state reaction method. SBNN showed 'filled' tetragonal tungsten-bronze structure with fully occupied A-sites. The tetragonal structure, as revealed by X-ray diffraction (XRD) and Raman spectroscopy, was not affected by the Ca-dopant. Effects of Ca-doping concentration on the phase transitions as well as ferroelectric, piezoelectric and pyroelectric properties of the SBNN ceramics were investigated. From the dielectric studies, two anomalies were observed, namely, a sharp normal ferroelectric transition at 260 °C and a broad maximum at round -110 °C. The later was affected by the Ca-doping concentration and its origin was discussed. At x = 0.3, the sample exhibited the highest pyroelectric coefficient of 168 μC/m 2 K and the largest piezoelectric coefficient (d 33) of 63 pC/N at room temperature. On the basis of our results, the pyroelectric properties of the SBNN were improved by Ca-doping.
URI: http://hdl.handle.net/10397/28559
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2012.07.038
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