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Sintering and Characterization of a Transparent Ferroelectric NaNbO3 Ceramic
X. Lin, Z.-F. Li, L.-F. Shu
College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, P. R. China
received October 21, 2016, received in revised form December 28, 2016, accepted Febuary 8, 2017
Vol. 8, No. 2, Pages 209-212 DOI: 10.4416/JCST2016-00085
Abstract
NaNbO3 transparent ceramics were prepared with a delicately controlled solid state reaction method. The structures and properties of the samples were determined using X-ray diffraction (XRD), scanning electron microscope (SEM), ferroelectric hysteresis loops and UV-Vis spectroscopy. The XRD results showed that the antiferroelectric Pbcm and ferroelectric R3c phases coexist in NaNbO3 ceramics. In SEM images, the NaNbO3 ceramics presented a compact microstructure with fewer pores among its grains, enhancing its light transmission and weakening its absorption and reflection, which was confirmed with UV-Vis spectroscopy. The high transparency of the NaNbO3 ceramic was approximately 95 % for ultraviolet light and up to 97 % for visible light with a wavelength of more than 450 nm, corresponding to the band gap of 2.76 eV. The tunic-shaped hysteresis loops of the NN ceramic indicated that two phases co-contributed to its ferroelectricity. A high storage energy density of 650.40 kJ/m3 and breakdown voltage of 17.00 kV/mm were obtained. NaNbO3 transparent ceramics therefore have practical applications in capacitors for energy storage.
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Keywords
Transparent ceramics, NaNbO3, transmission, ferroelectric properties
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