Crystal structure and electrical properties of bismuth sodium titanate zirconate ceramics |
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Authors: | Ampika Rachakom Panupong Jaiban Sukanda Jiansirisomboon Anucha Watcharapasorn |
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Affiliation: | (1) Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand;(2) Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand |
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Abstract: | Lead-free bismuth sodium titanate zirconate (Bi0.5Na0.5Ti1-xZrxO3 where x = 0.20, 0.35, 0.40, 0.45, 0.60, and 0.80 mole fraction) BNTZ] ceramics were successfully prepared using the conventional
mixed-oxide method. The samples were sintered for 2 h at temperatures lower than 1,000°C. The density of the BNTZ samples
was at least 95% of the theoretical values. The scanning electron microscopy micrographs showed that small grains were embedded
between large grains, causing a relatively wide grain size distribution. The density and grain size increased with increasing
Zr concentration. A peak shift in X-ray diffraction patterns as well as the disappearance of several hkl reflections indicated
some significant crystal-structure changes in these materials. Preliminary crystal-structure analysis indicated the existence
of phase transition from a rhombohedral to an orthorhombic structure. The dielectric and ferroelectric properties were also
found to correlate well with the observed phase transition. |
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Keywords: | ceramics X-ray diffraction dielectric properties ferroelectricity |
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