Sintering characteristic and microwave dielectric properties of ultra-low loss Li2Mg3TiO6 ceramic prepared by reaction-sintering process

Microwave dielectric properties and microstructures of ultra-low loss Li 2 Mg 3 TiO 6 ceramic prepared by reaction-sintering method (RS) and conventional solid-state reaction method (CS) have been investigated. The XRD patterns and SEM images revealed that the single phase of Li 2 Mg 3 TiO 6 and uniform morphology are obtained by both RS and CS methods at the optimal sintering temperatures. In order to further investigate the effects of different sintering methods on the microwave dielectric properties of Li 2 Mg 3 TiO 6 ceramics, the oxide polarizabilities and packing fraction were calculated based on the Rietveld refinement. The calculation results revealed that the RS method was more beneficial to the microwave dielectric properties of Li 2 Mg 3 TiO 6 ceramics in comparison with CS method. Excellent microwave dielectric properties for Li 2 Mg 3 TiO 6 ceramics with enhanced Q ×  f value of 157,036 GHz could be obtained using RS method sintered at 1250 °C for 6 h.