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Microwave Dielectric Properties of Temperature-Stable BaLn2(MoO4)4–TiO2 (Ln = Ce, Nd, and Sm) Ceramics

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Abstract

A series of temperature-stable microwave dielectric ceramics (1 − x)Ba Ln2(MoO4)4–xTiO2 (Ln = Ce, Nd, and Sm; 0.4 ≤ x ≤0.55) were prepared by solid-state reaction. Sintering behavior, phase composition, microstructure, and microwave dielectric properties were investigated. X-ray powder diffraction and scanning electron microscopy revealed that the main phases of the BaLn2(MoO4)4–TiO2 ceramics were the monoclinic BaLn2(MoO4)4 phase and the rutile TiO2 phase. Study of the materials’ microwave dielectric properties revealed that the permittivity (ε r) and the temperature coefficient of the resonant frequency (τ f) increased gradually with increasing x value whereas quality factors (Q × f) decreased. For BaLn2(MoO4)4–TiO2 (Ln = Ce and Nd), τ f values could be adjusted to near zero, relative permittivity (ε r) was 13.2–14.3, and Q × f values were between 11,950 and 45,720 GHz (at 9.11–9.83 GHz) when x = 0.45 to 0.55. For BaSm2(MoO4)4–TiO2, excellent microwave dielectric properties were obtained when x = 0.4 to 0.5, τ f values could be adjusted to near zero, ε r was 13.1–13.9, and Q × f values were between 25,520 and 63,130 GHz (at 9.31–10.11 GHz).

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51202182), the Fundamental Research Funds for the Central University, the international cooperation project of Shaanxi Province (2013KW12–04), and the 111 Project of China (B14040). SEM work was performed at the International Center for Dielectric Research (ICDR), Xi’an Jiaotong University, Xi’an, China, and the authors thank Ms Yan-Zhu Dai for her help with SEM.

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Authors and Affiliations

  1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, China

    Wen-Bo Li, Hai-Hong Xi & Di Zhou

  2. Xi’an Jiaotong University Suzhou Academy, Suzhou, 215123, Jiangsu, China

    Di Zhou

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  1. Wen-Bo Li
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  2. Hai-Hong Xi
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  3. Di Zhou
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Correspondence to Di Zhou.

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Li, WB., Xi, HH. & Zhou, D. Microwave Dielectric Properties of Temperature-Stable BaLn2(MoO4)4–TiO2 (Ln = Ce, Nd, and Sm) Ceramics. J. Electron. Mater. 44, 4250–4254 (2015). https://doi.org/10.1007/s11664-015-3946-7

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  • DOI: https://doi.org/10.1007/s11664-015-3946-7

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