Abstract
Dense Ca1-xNdxW1-xVxO4 (x = 0−0.4) microwave dielectric ceramics were obtained when sintered at 1150 °C for 4 h. A tetragonal scheelite could be formed in the range of x ≤ 0.3, while a composite region with tetragonal scheelite and tetragonal zircon was found at x ≥ 0.4. The relative permittivity (εr) increased from 10.15 to 13.66, mainly attributed to an increase in the ionic polarizability. The quality factor (Q×f) decreased from 61,060 to 32,204 GHz, correlated to the variations in lattice energy and the Raman FWHM. The temperature coefficient of resonant frequency (τf) gradually increased from −54.03 to −23.50 ppm/℃, mainly affected by the rattling effect of W6+/V5+ and the temperature coefficient of ion polarizability (ταm). Ca0.7Nd0.3W0.7V0.3O4 with excellent comprehensive properties (εr = 13.21, Q×f = 35,570 GHz, and τf = −23.50 ppm/°C) were obtained at 1150 °C.
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