Structure and Dielectric Properties of NiTiO3 Powders Synthesized by the Modified Sol–Gel Method |
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| Authors: | Shiow‐Huey Chuang Min‐Lung Hsieh Ding‐Yeong Wang |
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| Affiliation: | 1. Department of Applied Chemistry, National University of Kaoshiung, Kaoshiung 81148, Taiwan, R.O.C., Tel: +886‐7‐591‐9461;2. Fax: +886‐7‐591‐9461;3. Electronics and Opto‐Electronics Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, R.O.C. |
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| Abstract: | This study reports the synthesis of nickel titanate (NiTiO3) powders by using the modified sol‐gel method, with nickel acetate tetrahydrate as the nickel source, titanium isopropoxide as the titanium source, and 2‐methoxyethanol as the solvent, followed by post‐heat treatment in air at temperatures ranging from 500 °C to 900 °C. The characteristics of powders were determined by X‐ray diffraction (XRD), FT‐infrared spectroscopy (FT‐IR), ultraviolet/visible spectroscopy (UV/Vis), and Raman spectroscopy. The particle size and surface area of the powders were also measured. The results indicated that single‐phase NiTiO3 can be prepared using the modified sol‐gel method, followed by post‐heat treatment at the relatively low temperature of 550 °C. The crystallite sizes and particle sizes of NiTiO3 powders increase in conjunction with the post‐heat treatment temperatures. However, the surface area of the powders shrinks as the post‐heat treatment temperatures increase. The dielectric constants of NiTiO3 powders, based on the capacitance‐voltage analysis, are within a range of 13.2 to 17.8. |
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| Keywords: | Nickel titanate NiTiO3 powder Sol‐gel method Dielectric constant |
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