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Dense microwave dielectric ceramics of Ce2[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 R3¯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 Ce2[Zr0.94(Al1/2Ta1/2)0.06]3(MoO4)9 with a relative permittivity (ɛr) of 10.46, quality factor (Q × f ) of 83,796 GHz, and temperature coefficient of resonant frequency (τf) of -11.50 ppm/℃ were achieved at 850 ℃.


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Crystal structure and enhanced microwave dielectric properties of the Ce2[Zr1-x(Al1/2Ta1/2)x]3(MoO4)9 ceramics at microwave frequency

Show Author's information Chao FENGaXu ZHOUaBingjing TAOaHaitao WUb( )Shifeng HUANGa( )
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China
School of Environmental and Material Engineering, Yantai University, Yantai 264005, China

Abstract

Dense microwave dielectric ceramics of Ce2[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 R3¯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 Ce2[Zr0.94(Al1/2Ta1/2)0.06]3(MoO4)9 with a relative permittivity (ɛr) of 10.46, quality factor (Q × f ) of 83,796 GHz, and temperature coefficient of resonant frequency (τf) of -11.50 ppm/℃ were achieved at 850 ℃.

Keywords:

microwave dielectric ceramics, Ce2[Zr1-x(Al1/2Ta1/2)x]3(MoO4)9 (CZMAT), Phillips-Van Vechten-Levine (P-V-L) theory, low sintering temperature
Received: 20 June 2021 Revised: 24 September 2021 Accepted: 27 September 2021 Published: 11 February 2022 Issue date: March 2022
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Publication history

Received: 20 June 2021
Revised: 24 September 2021
Accepted: 27 September 2021
Published: 11 February 2022
Issue date: March 2022

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© The Author(s) 2021.

Acknowledgements

This work was supported by Shandong Postdoctoral Innovative Talents Support Plan (No. SDBX2020010), the National Natural Science Foundation of China (No. U1806221), Shandong Provincial Natural Science Foundation (No. ZR2020KA003), and the Project of "20 Items of University" of Jinan (No. 2019GXRC017). This work was also supported by the National Natural Science Foundation of China (No. 51972143).

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