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Journal of Advanced Ceramics 2023, 12(1): 82-92 https://doi.org/10.26599/JAC.2023.9220668
Research Article | Open Access | Issue | Published: 07 December 2022

Crystal structure, chemical bond characteristics, infrared reflection spectrum, and microwave dielectric properties of Nd2(Zr1−xTix)3(MoO4)9 ceramics

Show Author's Information Jian BAOa,  Yuping ZHANGa,  Hideo KIMURAa,  Haitao WUa( ),  Zhenxing YUEb( )
School of Environmental and Material Engineering, Yantai University, Yantai 264005, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Keywords:
microwave dielectric ceramics (MWDCs), Nd2(Zr1−xTix)3(MoO4)9 (NZ1−xTxM), Phillips–van Vechten–Levine (P–V–L) theory, theoretical dielectric loss
Cite this article:
BAO J, ZHANG Y, KIMURA H, et al. Crystal structure, chemical bond characteristics, infrared reflection spectrum, and microwave dielectric properties of Nd2(Zr1−xTix)3(MoO4)9 ceramics. Journal of Advanced Ceramics, 2023, 12(1): 82-92. https://doi.org/10.26599/JAC.2023.9220668
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Abstract Full text Electronic supplementary material About this article

Microwave dielectric ceramics (MWDCs) with low dielectric constant and low dielectric loss are desired in contemporary society, where the communication frequency is developing to high frequency (sub-6G). Herein, Nd2(Zr1−xTix)3(MoO4)9 (NZ1−xTxM, x = 0.02–0.10) ceramics were prepared through a solid-phase process. According to X-ray diffraction (XRD) patterns, the ceramics could form a pure crystal structure with the R 3¯c (167) space group. The internal parameters affecting the properties of the ceramics were calculated and analyzed by employing Clausius–Mossotti relationship, Shannon’s rule, and Phillips–van Vechten–Levine (P–V–L) theory. Furthermore, theoretical dielectric loss of the ceramics was measured and analyzed by a Fourier transform infrared (IR) radiation spectrometer. Notably, when x = 0.08 and sintered at 700 ℃, optimal microwave dielectric properties of the ceramics were obtained, including a dielectric constant (εr) = 10.94, Q·f = 82,525 GHz (at 9.62 GHz), and near-zero resonant frequency temperature coefficient (τf) = −12.99 ppm/℃. This study not only obtained an MWDC with excellent properties but also deeply analyzed the effects of Ti4+ on the microwave dielectric properties and chemical bond characteristics of Nd2Zr3(MoO4)9 (NZM), which laid a solid foundation for the development of rare-earth molybdate MWDC system.


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Crystal structure, chemical bond characteristics, infrared reflection spectrum, and microwave dielectric properties of Nd2(Zr1−xTix)3(MoO4)9 ceramics

Show Author's information Jian BAOa, Yuping ZHANGa, Hideo KIMURAa, Haitao WUa( ), Zhenxing YUEb( )
School of Environmental and Material Engineering, Yantai University, Yantai 264005, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Abstract

Microwave dielectric ceramics (MWDCs) with low dielectric constant and low dielectric loss are desired in contemporary society, where the communication frequency is developing to high frequency (sub-6G). Herein, Nd2(Zr1−xTix)3(MoO4)9 (NZ1−xTxM, x = 0.02–0.10) ceramics were prepared through a solid-phase process. According to X-ray diffraction (XRD) patterns, the ceramics could form a pure crystal structure with the R 3¯c (167) space group. The internal parameters affecting the properties of the ceramics were calculated and analyzed by employing Clausius–Mossotti relationship, Shannon’s rule, and Phillips–van Vechten–Levine (P–V–L) theory. Furthermore, theoretical dielectric loss of the ceramics was measured and analyzed by a Fourier transform infrared (IR) radiation spectrometer. Notably, when x = 0.08 and sintered at 700 ℃, optimal microwave dielectric properties of the ceramics were obtained, including a dielectric constant (εr) = 10.94, Q·f = 82,525 GHz (at 9.62 GHz), and near-zero resonant frequency temperature coefficient (τf) = −12.99 ppm/℃. This study not only obtained an MWDC with excellent properties but also deeply analyzed the effects of Ti4+ on the microwave dielectric properties and chemical bond characteristics of Nd2Zr3(MoO4)9 (NZM), which laid a solid foundation for the development of rare-earth molybdate MWDC system.

Keywords: microwave dielectric ceramics (MWDCs), Nd2(Zr1−xTix)3(MoO4)9 (NZ1−xTxM), Phillips–van Vechten–Levine (P–V–L) theory, theoretical dielectric loss

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Publication history

Received: 30 April 2022
Revised: 24 August 2022
Accepted: 27 September 2022
Published: 07 December 2022
Issue date: January 2023

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© The Author(s) 2022.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51972143 and 52272126) and State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (No. KFZD202101). The authors are also thankful to the administrators in the IR beamline workstation of NSRL for the help in the IR measurement.

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