Effect of Oxygen Partial Pressure During Liquid-Phase Sintering on the Dielectric Properties of 0.9MgTiO3–0.1CaTiO3 |
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| Authors: | Hee-Kyun Shin Hyunho Shin Shin-Tae Bae Sangwook Lee Kug Sun Hong |
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| Affiliation: | School of Materials Science and Engineering, Seoul National University, Seoul 151-741, Korea;
Department of Ceramic Engineering, Kangnung National University, Kangnung 210-702, Korea |
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| Abstract: | Microstructural evolution and microwave dielectric properties of liquid-phase-sintered 0.9MgTiO3–0.1CaTiO3 dielectric ceramic material have been investigated as a function of oxygen partial pressure ( ) during sintering. Sintering in a weakly reducing atmosphere ( =10−14 atm) generally increased the density, permittivity, quality factor ( Q × f ), and the temperature coefficient of resonance frequency (τf), but further reducing atmosphere down to of 10−14 atm generally decreased Q × f and τf. When the 5 wt% lithium borosilicate glass-added specimen was sintered at 950°C and =10−14 atm, it demonstrated a permittivity of 18.8, Q × f of 19 000 GHz, and τf of 10 × 10−6 K−1. |
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