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Preparation and characterization of the temperature-stable CaO-Li2O-Nd2O3-TiO2 microwave dielectric ceramics

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Abstract

The perovskite-structured CaTiO3-based microwave dielectric ceramics play an essential role in the technical field of communication. This study is intended to obtain a temperature-stable Ca-Li-Nd-Ti microwave dielectric ceramic and explore the changing mechanism of dielectric properties. So the (Ca0.61Nd0.26)1-x(Li0.5Nd0.5)xTi0.96(Al0.5Nb0.5)0.04O3 (0 ≤ x ≤ 0.8, shorted as CLNTAN) microwave dielectric ceramics were designed, prepared and characterized in this paper. All constituents form a single phase of orthorhombic perovskite. SEM images verify that the polygonal grains gradually become cubic morphology as the x value increases for CLNTAN samples. Raman spectra show a distinct blue shift of vibrational modes by increasing the x value, and the broadened Raman peaks indicate a declined tendency of Q × f value. Interestingly, the εr values of samples reach the maximum at x = 0.7, then decrease as the x value increases. This finding is related to the bond valence at B-site. In addition, the τf values of samples exhibit a decreased tendency, and the temperature-stable (τf = –1.4 ppm/°C) CLNTAN ceramic with a high εr value of 129.2 was obtained at x = 0.76 when it was sintered at 1230 °C.

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Funding

This work is supported by the Sichuan Province Science and Technology Support Program (Grant No. 2021YJ0560), the Natural Science Foundation of Sichuan Province (2022NSFSC0524), Transfer Payment Project of Sichuan Province under Grant (R21ZYZF0001), and the Scientific Research Foundation of CUIT (Grant No. KYTZ202179).

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Authors and Affiliations

  1. Sichuan Province Key Laboratory of Information Materials and Devices Application, College of Optoelectronic Engineering, Chengdu University of Information Technology, Chengdu, 610225, China

    Zhe Xiong, Xing Zhang, Wenjuan Wu & Lezhong Li

  2. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Bin Tang

  3. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Bin Tang

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  1. Zhe Xiong
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by ZX and XZ. The first draft of the manuscript was written by ZX and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Xiong, Z., Zhang, X., Wu, W. et al. Preparation and characterization of the temperature-stable CaO-Li2O-Nd2O3-TiO2 microwave dielectric ceramics. J Mater Sci: Mater Electron 34, 610 (2023). https://doi.org/10.1007/s10854-023-10028-2

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