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Sintering and Characterization of a Transparent Ferroelectric NaNbO₃ Ceramic

X. Lin, Z.-F. Li, L.-F. Shu

Journal of Ceramic Science and Technology, Vol. 8, No. 2 (2017), pp. 209-212

DOI: 10.4416/JCST2016-00085

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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.

Keywords

Transparent ceramics, NaNbO3, transmission, ferroelectric properties

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