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- Title
Effect of TiO<sub>2</sub> on microstructure and microwave dielectric properties of TiO<sub>2</sub>–CaF<sub>2</sub> ceramics prepared by two-step sintering assisted by cold sintering.
- Authors
Guo, Ningjie; Long, Shenfeng; Zhu, Guisheng; Xu, Huarui; Jiang, Xupeng; Zhang, Xiuyun; Song, Jinjie; Wei, Tingting; Zhao, Yunyun; Jiang, Kunpeng; Xu, Yaoben; Liang, Dabin; Huang, Tianying
- Abstract
CaF2 with low εr has excellent microwave dielectric properties, Qf = 26,448 GHz, εr = 6.48, τf = − 106 ppm/°C. However, its relatively negative temperature coefficient of resonant frequency (τf) greatly inhibits its commercial application. In this work, xTiO2–CaF2 (x = 0 wt%, 0.05 wt%, 0.1 wt%, 0.125 wt%, 0.15 wt%) ceramics were prepared by cold-sintering assisted two-step sintering method, and the effects of TiO2 addition amount on phase composition, microstructure and microwave dielectric properties were systematically studied. It was found that 0 wt% TiO2–CaF2 (the pure CaF2) ceramics obtained a high Qf value of 66,043.27 GHz after two steps of cold-sintering-assisted sintering, which was 2.5 times higher than that of conventional sintering (Qf = 26,448 GHz). X-ray diffraction and scanning electron microscopy (SEM) data show that the added TiO2 reacts with CaF2 matrix to generate CaTiO3 during high-temperature sintering. In addition, with the increase of x, ceramic τf is gradual increase, while εr and Qf decrease to a certain extent. The optimal microwave dielectric property combination with τf value near zero (Qf = 14,080.74 GHz, εr = 6.87, τf = − 3.79 ppm/°C) was obtained at x = 0.1 wt% and 950 °C. The good chemical compatibility between TiO2–CaF2 ceramics and Ag is verified, which indicates that they have broad application prospects in low temperature cofired ceramic technology.
- Publication
Journal of Materials Science: Materials in Electronics, 2023, Vol 34, Issue 27, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-023-11150-x