Abstract
Dielectric properties of the Ca2/5Sm2/5TiO3-Li1/2Ln1/2TiO3 (Ln=Sm, Nd) ceramics have been investigated as a function of excess TiO2 at microwave frequencies. The variation of the dielectric constant and the temperature coefficient of the resonant frequencies (TCF) of the specimens with an increase of the amount of TiO2 could be explained by the volume mixing rule. The Q·f values of the specimens were decreased with an increase of the amount of TiO2. Typically, k of 92.5, Q·f of 4900 and TCF of +9 ppm/°C were obtained in the Ca2/5Sm2/5TiO3-Li1/2Sm1/2TiO3-0.8TiO2 specimen and k of 107, Q·f of 3300 and TCF of 0.0ppm/° C were also obtained in the Ca2/5Sm2/5TiO3-Li1/2Nd1/2TiO3-0.6TiO2 specimen
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