| Forsterite samples were prepared from pure Mg0-Si02 and
talc-magnesite. In the talc-magnesite batches, ball clay and
BaC08 were also used as additives. Samples of 2n diameter
were prepared and sintered at different temperatures
(l160°-1400°C) for different times (4!-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% BaC03, having a relative density
of 0.93, the K and tan 8 values were 6.63 and 5 x 10-
respectively and that of pure Mg0-Si02 with relative density
0.89 had shown K = 5.55 and tan 8 = 14X 10-. |
