Cerium oxide (CeO 2 ) has been prepared as a ceramic dielectric resonator by a conventional solid-state ceramic route.The sintered CeO 2 has a high dielectric quality factor (Q؋f), Q value of 10 000 at 6 GHz with a relative permittivity () of 23, and temperature coefficient of resonant frequency ( f ) of ؊53 ppm/°C.The Q value increases to 20 000 at 6 GHz when the CeO 2 is doped with 1 mol% CaCO 3 .Higher levels of CaCO 3 doping lowers the Q and values and simultaneously decreases f .TiO 2 doping decreases f and slightly increases , but deceases the Q value.The Q value of pure CeO 2 increases to 105 000 at a frequency of 5.58 GHz when it is cooled to 30 K, whereas Q Ϸ 85 000 at 5.48 GHz for 1-mol%-CaCO 3 -doped CeO 2 at 30 K.
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Santha et al. (2004) studied this question.
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