Phase composition, crystal structure and microwave dielectric properties of Mg2−xCuxSiO4 ceramics. Issue 4 (April 2018)

• Record Type: Journal Article
• Authors: Lai, Yuanming; Tang, Xiaoli; Huang, Xin; Zhang, Huaiwu; Liang, Xiaofeng; Li, Jie; Su, Hua
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 4(2018)
• Page Start: 1508
• Page End: 1516
• Publication Date: 2018-04
• Subjects: Mg2−xCuxSiO4 ceramics -- Phase composition -- Crystal structure -- Microwave dielectric properties; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.10.035
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In this work, the Mg2- x Cu x SiO4 ( x = 0–0.40) microwave dielectric ceramics were prepared using solid-state reaction method. Compared with the Mg2 SiO4 sample, the Cu-substituted Mg samples could be sintered at a lower temperature. The Mg2− x Cu x SiO4 ceramics exhibit the composite phases of Mg2 SiO4 and a small quantity of MgSiO3 . The Cu 2+ ion presented a solid solution with the Mg2 SiO4 phase and preferentially occupy Mg(1) site. The distortion of MgO6 octahedron was modified by Cu 2+ ions, resulting in a positive change in the temperature coefficient of resonance frequency ( τ f ) values. Excellent microwave dielectric properties of ε r = 6.35, high Qf of ∼ 188, 500 GHz and near zero τ f = −2.0 ppm/°C were achieved at x = 0.08 under sintering at 1250 °C for 4 h. Thus, the fabricated ceramics were considered as possible candidates for millimeter-wave device applications.