Journal
JOURNAL OF ADVANCED CERAMICS
Volume 11, Issue 3, Pages 392-402Publisher
SPRINGER
DOI: 10.1007/s40145-021-0541-7
Keywords
microwave dielectric ceramics; Ce-2[Zr1-x(Al1-2Ta1-2)(x)](3)(MoO4)(9) (CZMAT); Phillips-Van Vechten-Levine (P-V-L) theory; low sintering temperature
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Funding
- Shandong Postdoctoral Innovative Talents Support Plan [SDBX2020010]
- National Natural Science Foundation of China [51972143]
- Shandong Provincial Natural Science Foundation [ZR2020KA003]
- Project of 20 Items of University of Jinan [2019GXRC017]
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In this study, dense microwave dielectric ceramics of Ce-2[Zr1-x(Al1/2Ta1/2)(x)](3)(MoO4)(9) were prepared via the solid-state route, and their microstructures, sintering behaviors, and microwave dielectric properties were investigated. The results showed that Ce-2[Zr-0.94(Al1/2Ta1/2)(0.06)](3)(MoO4)(9) exhibited excellent dielectric properties at 850℃.
Dense microwave dielectric ceramics of Ce-2[Zr1-x(Al1/2Ta1/2)(x)](3)(MoO4)(9) (CZMAT) (x = 0.02-0.10) were prepared by the conventional solid-state route. The effects of (Al1/2Ta1/2)(4+) on their microstructures, sintering behaviors, and microwave dielectric properties were systematically investigated. On the basis of the X-ray diffraction (XRD) results, all the samples were matched well with Pr2Zr3(MoO4)(9) structures, which belonged to the space group R<(3)over bar >c. The lattice parameters were obtained using the Rietveld refinement method. The correlations between the chemical bond parameters and microwave dielectric properties were calculated and analyzed by using the Phillips-Van Vechten-Levine (P-V-L) theory. Excellent dielectric properties of Ce-2[Zr-0.94(Al1/2Ta1/2)(0.06)](3)(MoO4)(9) with a relative permittivity (epsilon(r)) of 10.46, quality factor (Q x f) of 83,796 GHz, and temperature coefficient of resonant frequency (tau(f)) of -11.50 ppm/degrees C were achieved at 850 degrees C.
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