Abstract
CaTiO3-LaAlO3 solid solution with perovskite structure has suitable relative permittivity (εr) and high quality factor (Q×f) for application as dielectric resonators, but the negative value of the temperature coefficient of resonance frequency (τf) affects its utilization. To improve dielectric properties and adjust lattice matching, Y3+ ion was selected as doping element to prepare the 0.65CaTiO3-0.35(La1-xYx)AlO3 (x=0, 0.02, 0.04, 0.06, 0.08 ) microwave dielectric ceramics by conventional mixed solid method. The effects of Y3+ ion doping on the crystal structure and microwave dielectric properties were investigated. The results revealed that a single orthorhombic phase for all the compositions can form and the unit cell volume increases linearly with the doping content x. Y3+ ion dopant can increase the quality factor and improve the temperature coefficient of resonant frequency of 0.65CaTiO3-0.35LaAlO3 ceramics. When x = 0.02, the optimal microwave dielectric properties of εr=45.8, Q×f = 38957 GHz, and τf = 4×10−6/oC for the 0.65CaTiO3-0.35(La1-xYx)AlO3 ceramics could be obtained, which sintered at 1500 °C for 5 h.
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