Microwave dielectric properties of Ca[(Li1/3Nb2/3)(1-x)M-x]O3-delta (M = Sn, Ti) ceramics

The microwave dielectric properties of Ca[(Li1/3Nb2/3)(1-x)M-x]O3-delta (M = Sn, Ti, 0 less than or equal to x less than or equal to 0.5) ceramics wer e investigated. In general, the ceramics prepared were multiphase materials . However, single-phase specimens having orthorhombic perovskite structure similar to CaTiO3 could be obtained in the vicinity of Sn = 0.2 to 0.3, and Ti = 0.2. As Sn concentration increased, the dielectric constant (epsilon( r)) decreased and the quality factor (Q) significantly increased within the limited Sn concentration. As Ti concentration increased, the dielectric co nstant (epsilon(r)) increased, the quality factor (Q) decreased, and the te mperature coefficient of resonant frequency (tau(f)) changed from a negativ e to positive value. The temperature coefficient of resonant frequency of 0 ppm/degrees C was realized at Ti = 0.2. The Q . f(o) value and epsilon(r) for this composition were found to be 26100 GHz and 38.6, respectively.