Microwave dielectric properties of Li₂MgTiO₄ ceramics synthesized via high energy ball milling method

ABSTRACT

Li₂MgTiO₄ ceramics were prepared with Li₂CO₃, TiO₂ and MgO by high energy ball mill method. After mixtures ball-milling 30 h and calcining at 700°C, the homogenate Li₂MgTiO₄ powders with average particle size of 160 nm were obtained. The pure phase obtained temperature was about 300°C lower than that by a conventional solid-state reaction process. Due to Li⁺ evaporation, the Li₂MgTiO₄ ceramics sintered at high temperature existed with some Mg₂TiO₄. The Li₂MgTiO₄ ceramics at 1250°C had an excellent microwave dielectric properties ϵ_r = 12.17, Q × f = 42000 GHz and an τ_f = −23 ppm/°C

Keywords:

• Li₂MgTiO₄
• high energy ball milling
• ceramics
• microwave dielectric properties

Funding

The work was supported by the Natural Science Foundation of China (Grants Nos.51272150, 51072110); The Fundamental Research Funds for the Central Universities (GK201401003).