Abstract
Microwave dielectric properties of 0.95Ca 0.85 Nd 0.1 TiO₃-0.05LnAlO₃ (Ln=Sm, Dy, Er) were investigated as a function of sintering temperature and lanthanide ion type. A single perovskite phase with an orthorhombic structure was obtained throughout the entire range of composition. The dielectric constant (K) was dependent upon the dielectric polarizabilities and the B-site bond valence in the ABO₃ perovskite structure. The quality factor (Qf) of the specimens with ErAlO₃ was smaller than those with SmAlO₃ and/or DyAlO₃ due to the smaller grain size. The temperature coefficient of resonant frequency (TCF) could be controlled from 107.28 ppm/℃ at Ln=Sm to 87.23 ppm/℃ at Ln=Er due to the changes of B-site bond valence in the ABO₃ perovskite structure.
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