Microwave Dielectric Properties of Low-Fired Ba5Nb4O15 |
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| Authors: | Dong-Wan Kim Jeong-Ryeol Kim Sung-Hun Yoon Kug Sun Hong Chang Kyung Kim |
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| Affiliation: | School of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul, Korea;Department of Inorganic Materials Engineering, Division of Materials Science and Engineering, Hanyang University, Seoul, Korea |
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| Abstract: | The effect of B2O3 on the sintering temperature and microwave dielectric properties of Ba5Nb4O15 has been investigated using X-ray powder diffraction, scanning electron microscopy, and a network analyzer. Interactions between Ba5Nb4O15 and B2O3 led to formation of second phases, BaNb2O6 and BaB2O4. The addition of B2O3 to Ba5Nb4O15 resulted in lowering the sintering temperature from 1400° to 925°C. Low-fired Ba5Nb4O15 could be interpreted by measuring changes in the quality factor ( Q × f ), the relative dielectric constant (ɛr), and the temperature coefficient of resonant frequency (τf) as a function of B2O3 additions. More importantly, the formation of BaNb2O6 provided temperature compensation. The microwave dielectric properties of low-fired Ba5Nb4O15 had good dielectric properties: Q × f = 18700 GHz, ɛr= 39, and τf= 0 ppm/°C. |
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| Keywords: | microwaves dielectric materials/properties barium |
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