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 (f), but further reducing atmosphere down to of 10−14 atm generally decreased Q×f and f. 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 f of 10 × 10−6 K−1.
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Document Type: Research Article
School of Materials Science and Engineering, Seoul National University, Seoul 151-741, Korea
Department of Ceramic Engineering, Kangnung National University, Kangnung 210-702, Korea
Publication date: January 1, 2008