Preparation and Characterization of Forsterite and Measurement of its Dielectric Constant and Loss Factor in the Frequency Range of 100 Kc/S to 25 Mc/S

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Abstract
Forsterite samples were prepared from pure MgO-SiO2 and talc-magnesite. In the talc-magnesite batches, ball clay and BaCO3 were also used as additives. Samples of 2” diameter were prepared and sintered at different temperatures (1160°-1400°C) for different times (4½-20 hours). X-ray analysis was performed for identification of phases. Sintered samples were polished and the measurement of the relative dielectric constant K and the quality factor Q were conducted in the frequency range of 100 Kc/s to 25 Mc/s using Boonton Radio Co Q-meter Model 260-A.P. The K and Q measurements were done with electroded and wired forsterite samples. For the best sample, made of talc-magnesite and 6.54 % BaCO3, having a relative density of 0.93, the K and tan δ values were 6.63 and 5×10−4 respectively and that of pure MgO-SiO2 with relative density 0.89 had shown K = 5.55 and tan δ = 14×10−4

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