A low-temperature reactive sintering process for the 5Li2O-1Nb2O5-5TiO2 microwave dielectric ceramics

The B2O3-doped 5Li2O-1Nb2O5-5TiO2 composite microwave dielectric ceramics prepared by conventional and low-temperature single-step reactive sintering processes were investigated in the study. Without any calcinations involved, the Nb2O5 mixture of Li2CO3 and TiO2 was pressed and sintered directly in the reactive sintering process. More uniform and finer grains could be obtained in the 5Li2O-1Nb2O5-5TiO2 ceramics by reactive sintering process, which could effectively save energy and manufacturing cost. And relatively good microwave dielectric properties of ɛr = 41, Q × f = 9885 GHz and τf = 43.6 ppm/°C could be obtained for the 1 wt.% B2O3-doped ceramics reactively sintered at 900 °C.