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Materials Science and Engineering of Powder Metallurgy  2023, Vol. 28 Issue (3): 253-261    DOI: 10.19976/j.cnki.43-1448/TF.2023022
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Effects of MgF2 doping on structure and microwave property of 0.95MgTiO3-0.05CaTiO3 ceramics
RAN Wen, LIU Fan, LI Hao, LIU Shaojun
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
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Abstract  MgF2 doped 0.95MgTiO3-0.05CaTiO3 (95MCT) microwave ceramics were synthesized by solid-phase reaction. The effects of MgF2 doping on the sintering temperature, crystal structure, microstructure and microwave properties of 95MCT ceramics were characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and vector network analyzer. The results show that a small amount of MgF2 doping can promote the uniform growth of ceramic grains. The addition of MgF2 inhibits the transition of Ti4+ ions to Ti3+ ions and enhances the Ti—O bonding strength of [TiO6] octahedra, thus significantly improving the quality factor of ceramics from 30 335 GHz to 89 470 GHz. MgF2 doped with 1% (mass fraction) of 95MCT ceramic sintered at 1 225 ℃ has excellent microwave properties: the relative permittivity εr is about 19.74, the Q×f value is about 89 470 GHz, and the resonant frequency temperature coefficient τf is about -10.2×10-6-1.
Key wordsMgTiO3-CaTiO3 ceramic      MgF2 doping      [TiO6] octahedra      sintering temperature      microwave property     
Received: 17 March 2023      Published: 06 July 2023
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RAN Wen
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Cite this article:   
RAN Wen,LIU Fan,LI Hao, et al. Effects of MgF2 doping on structure and microwave property of 0.95MgTiO3-0.05CaTiO3 ceramics[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(3): 253-261.
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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023022     OR     http://pmbjb.csu.edu.cn/EN/Y2023/V28/I3/253
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