期刊
ACS OMEGA
卷 1, 期 5, 页码 963-970出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.6b00274
关键词
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资金
- National Natural Science Foundation of China [U1632146]
- Young Star Project of Science and Technology of Shaanxi Province [2016YFXX0029]
- Fundamental Research Funds for Central University
- Guangxi Key Laboratory of Information Materials (Guilin University of Electronic Technology), P.R. China [161004-K]
- 111 Project of China [B14040]
- EPSRC [EP/L017563/1, EP/N010493/1] Funding Source: UKRI
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 degrees 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 (epsilon(r)) 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/degrees C. Excellent microwave dielectric properties were obtained for (Bi0.3Y0.7)VO4 sintered at 1025 degrees C and (Bi0.2Y0.8)VO4 sintered at 1075 degrees C with epsilon(r) similar to 19.35, microwave quality factor (Qf) similar to 25 760 GHz, and TCF similar to +17.8 ppm/degrees C and epsilon(r) similar to 16.3, Qf similar to 31 100 GHz, and TCF similar to -11.9 ppm/degrees 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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