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The improved microwave dielectric characteristics of TiO2 ceramics produced by Mn2+ and W6+ co-substitution

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Abstract

In this article, the strategy of co-doping Mn2+ ions with W6+ ions is used to improve the comprehensive dielectric performances of TiO2 ceramics. According to the analysis of XRD results, a pure TiO2 phase with a rutile structure can be found throughout the whole substitution range (0 ≤ x ≤ 0.02). Based on the refinement method, it is noted that the tetragonality firstly increase for 0 ≤ x ≤ 0.005, and then decreases for x > 0.005. A slight blue shift is observed for the A1g mode, whereas the Eg mode shows a red shift. The permittivity is highly dependent on the relative density, fc of Ti/(Mn0.5W0.5)-O1(1) and Ti/(Mn0.5W0.5)-O1(2) bond and Afc. The variation of quality factor strongly relies on the relative density, changing c/a value and valence state of Ti. The increase of c/a and elimination of Ti3+ contribute to the significant improvement of Q × f from 947 to 39,000 GHz. The τf dramatically decreases from 520 to 398 ppm/ºC because of the increase of unit cell volume. The excellent dielectric performance of Ti1-x(Mn0.5W0.5)xO2 ceramics can be achieved at x = 0.005 with εr = 105, Q × f = 39,000 GHz and τf = 464.4 ppm/ºC.

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Data availability

The datasets generated during and analysed during the current study are available from the corresponding author on reasonable request.

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Funding

The authors greatly acknowledge the financial support from National Natural Science Foundation of China (Grant Nos. 52102123 and 6171080), and Natural Science Foundation of Sichuan Province (Grant No. 2022NSFSC2008).

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Author notes

  1. Shiping Mao and Jun Yang have equally contributed to this paper.

Authors and Affiliations

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

    Shiping Mao, Chao Qu, Xing Zhang, Hongyu Yang, Chengtao Yang & Bin Tang

  2. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Jun Yang, Zixuan Fang & Khan Kashif

  3. China Zhenhua Group, Yunke Electronic Co., Ltd, Guiyang, 550018, China

    Jun Yang, Manli Gong & Laiyuan Ao

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

    Zhe Xiong

Authors
  1. Shiping Mao
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Contributions

All authors contributed to the study conception and design. ZF, CY, and BT coordinated this work. Material preparation, data collection and analysis of XRD, SEM, Raman spectrum and EDX were performed by SM and JY. MG, LA, KK, CQ, XZ, HY, and ZX carried out the deep analysis of the XPS, Raman spectrum, Rietveld refinement, and complex chemical bond theory. The draft of the manuscript was written by SM and JY under the guidance of ZF, CY, and BT. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Zixuan Fang, Chengtao Yang or Bin Tang.

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Mao, S., Yang, J., Gong, M. et al. The improved microwave dielectric characteristics of TiO2 ceramics produced by Mn2+ and W6+ co-substitution. J Mater Sci: Mater Electron 33, 27041–27052 (2022). https://doi.org/10.1007/s10854-022-09367-3

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