Journal of Materiomics

Journal of Materiomics

Volume 8, Issue 5, September 2022, Pages 949-957
Journal of Materiomics

Research paper
Sintering characteristics, crystal structure and dielectric properties of cobalt-tungsten doped molybdate-based ceramics at microwave frequency

https://doi.org/10.1016/j.jmat.2022.04.004Get rights and content
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Highlights

  • The effects of substitution of Zr4+ by (Co1/2W1/2)4+ on the properties were explored based on the P-V-L theory.

  • The contribution of different wavenumber segments to the permittivity was analyzed by IR reflectance spectroscopy.

  • Excellent dielectric properties were exhibited with εr = 9.95, Q·f = 80,803 GHz (at 9.99 GHz) and τf = − 9.10 ppm/°C.

Abstract

In this study, a sequence of Ce2[Zr1‐x(Co1/2W1/2)x]3(MoO4)9 (CZ1‐x(CW)xM) (x = 0.02–0.10) ceramics with excellent microwave dielectric properties were obtained by the traditional solid-phase method. The crystal structure, dielectric properties, and chemical bond characters of the ceramics were characterized and analyzed. X-ray diffraction and Rietveld refinement analysis show that CZ1‐x(CW)xM could form a single-phase of the triangular crystal system in the entire doping range. The microstructure of the ceramic samples was obtained by scanning electron microscopy. The sintering temperature was reduced and the gain of the sample was refined as the increase of doping ion content. Furthermore, the intrinsic factors affecting the properties of CZ1‐x(CW)xM were analyzed by employing P-V-L theory and through in-depth infrared analysis. When x was 0.04 and the sintering temperature was 750 °C, the best dielectric properties of the samples were achieved, including εr = 9.95, Q·f = 80,803 GHz (at 9.99 GHz), and τf = − 9.10 ppm/°C.

Keywords

Ce2[Zr1-x(Co1/2W1/2)x]3(MoO4)9
Rietveld refinement
P-V-L theory
Infrared analysis

Cited by (0)

Jian Bao is a postgraduate student in the School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China. He obtained his bachelor's degree in 2020 from University of Jinan. His research interest is microwave dielectric ceramics.

Yuping Zhang, PhD in Materials Science and engineering, lecturer of School of Environmental and Material Engineering, Yantai University. Her research interests are surface modification of carbon materials and ceramic composites

Haitao Wu, PhD in Engineering, doctoral supervisor, professor of School of Environmental and Material Engineering, Yantai University. His research interest covers dielectric properties and devices of information-functional ceramics.

Yuanyuan Zhou, PhD in Materials science, master supervisor, associate professor of School of Materials Science and Engineering, University of Jinan. Her main research interests are functional ceramics.

Zhenxing Yue, PhD in electronic materials and components, doctoral supervisor, professor of School of Materials Science and Engineering, Tsinghua University. Deputy director of the State Key Laboratory of New Ceramics and Fine Processing. His research interests include ferroelectric ceramics and piezoelectric ceramics, microwave dielectric ceramics, microwave magnetic materials, LTCC materials and ceramic integrated devices, and functional ceramic thin and thick film materials.

Peer review under responsibility of The Chinese Ceramic Society.