低介电常数MgxZn1.8-xSiO3.8微波陶瓷的结构与性能

doi:10.19976/j.cnki.43-1448/TF.2022005

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Abstract Mg_xZn_1.8-_xSiO_3.8(x=0, 0.1, 0.2, 0.3, 0.4) microwave ceramics with willemite structure were prepared by the traditional solid-phase synthesis method. The effect of Mg on crystal structure, microstructure and dielectric properties of Mg_xZn_1.8-_xSiO_3.8-_x ceramics were characterized on the basis of X-ray diffraction, raman spectroscopy, and scanning electron microscopy and vector network analyzer. The results show that the theoretical polarizability of Mg_xZn_1.8-_xSiO_3.8 microwave ceramics decreases, and the relative permittivity decreases correspondingly with the increase of doping Mg amount x of sintering temperature at 1 300 ℃. With the increase of x, the average twist of oxygen tetrahedron decreases first and then increases, resulting in the temperature coefficient of resonant frequency decreasing first and then increasing. With the increase of doping amount, the symmetry of the six-membered ring composed of Zn(1)/Mg(1)O₄, Zn(2)/Mg(2)O₄, and SiO₄ tetrahedra increases, while the Zn(Mg)—O bond length decreases and the bond energy increases, resulting in the quality factor Q×f increases. Mg_0.4Zn_1.4SiO_3.8ceramicshave excellent properties, the relative permittivity ε_r is about 6.2, the Q×f is about 112 100 GHz, and the resonant frequency temperature coefficient τ_f is about -19.2×10^-6℃.

Key words： low dielectric constant microwave ceramics doping crystal structure dielectric property

Received: 26 January 2022 Published: 19 July 2022

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	DUAN Jialu
	ZHOU Ganghuai
	LIU Shaojun

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DUAN Jialu,ZHOU Ganghuai,LIU Shaojun. Structure and properties of Mg_xZn_1.8-_xSiO_3.8 microwave ceramics with low dielectric constant[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(3): 276-283.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022005 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I3/276

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