A low-temperature reactive sintering process for the 5Li 2O–1Nb 2O 5–5TiO 2 microwave dielectric ceramics

Abstract

The B 2O 3-doped 5Li 2O–1Nb 2O 5–5TiO 2 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 Nb 2O 5 mixture of Li 2CO 3 and TiO 2 was pressed and sintered directly in the reactive sintering process. More uniform and finer grains could be obtained in the 5Li 2O–1Nb 2O 5–5TiO 2 ceramics by reactive sintering process, which could effectively save energy and manufacturing cost. And relatively good microwave dielectric properties of ɛ r = 41, Q × f = 9885 GHz and τ f = 43.6 ppm/°C could be obtained for the 1 wt.% B 2O 3-doped ceramics reactively sintered at 900 °C.