Synthesis, microstructure and microwave dielectric properties of Li₂Mg₃SnO₆ ceramics with excess lithium

Abstract

The sintering behavior, microstructure and microwave dielectric properties of Li_{2(1+ x )}Mg₃SnO₆ ceramics were investigated in order to prepare dense phase-pure ceramics samples. The phase structures, density variation and pore morphology were especially correlated with the subsequent microwave dielectric properties. The experimental results showed that single phase rock-salt structure Li₂Mg₃SnO₆ ceramics were obtained for x = 0.08. The actual sample density and microstructure (grain and pores) strongly depended on Li content x. The increasing in ε_r and Q×f values may be caused by increasing bulk density, reducing porosity as well as increasing grain boundaries. Well-densified Li_2.16Mg₃SnO₆ ceramics were obtained with excellent microwave dielectric properties of ε_r = 11.4, Q×f = 140660 GHz and τ_f = -40.5 ppm/°C at 1360 °C.

KEYWORDS:

• Ceramics
• Dielectric Properties
• Microstructure
• Li₂Mg₃SnO₆

Additional information

Funding

This work was supported by the Undergraduate Innovation and Entrepreneurship Training Program in Anhui of China (Grant No. 201710361302).