Abstract
A series of (Bi1–xYx)VO4 (0.4 ≤ x ≤ 1.0) ceramics were synthesized using the traditional solid-state reaction method. In the composition range of 0.4 ≤ x ≤ 1.0, a zircon-type solid solution was formed between 900 and 1550 °C. Combined with our previous work (scheelite monoclinic and zircon-type phases coexist in the range of x < 0.40), a pseudobinary phase diagram of BiVO4–YVO4 is presented. As x decreased from 1.0 to 0.40, the microwave permittivity (εr) of (Bi1–xYx)VO4 ceramics increased linearly from 11.03 to 30.9, coincident with an increase in the temperature coefficient of resonant frequency (TCF) from −61.3 to +103 ppm/°C. Excellent microwave dielectric properties were obtained for (Bi0.3Y0.7)VO4 sintered at 1025 °C and (Bi0.2Y0.8)VO4 sintered at 1075 °C with εr ∼ 19.35, microwave quality factor (Qf) ∼ 25 760 GHz, and TCF ∼ +17.8 ppm/°C and εr ∼ 16.3, Qf ∼ 31 100 GHz, and TCF ∼ −11.9 ppm/°C, respectively. Raman spectra, Shannon’s additive rule, a classical oscillator model, and far-infrared spectra were employed to study the structure–property relations in detail. All evidence supported the premise that Bi-based vibrations dominate the dielectric permittivity in the microwave region.
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