Abstract
In this work, a new low loss Ba3Ti4-x(Mn1/3Nb2/3)xNb4O21 (MN-BTN, 0 ≤ x ≤ 12 mol%) ceramics configuration was presented through preparing by the solid-state route. The XRD patterns, Rietveld refinement, microstructure, and microwave properties were systematically analyzed. All the fabricated MN-BTN ceramics belonged to the hexagonal structure with a P63/mcm space group. More specifically, the 6MN-BTN ceramic exhibited a high relative density of ~92.3 %, homogeneous grains distribution with an average size of ~71.95 µm, and several excellent microwave dielectric properties: εr = 59.67, Q×f= 16,226 GHz, τf= +103.9 ppm/℃ sintered at 1220 ℃. The incorporation of 1.5 wt% BaCu(B2O5) (BCB) compound within the 6MN-BTN ceramic not only effectively reduced the sintering temperature from 1220 ℃ to 950 ℃, but also the excellent microwave dielectric properties were maintained: εr = 42.33, Q×f= 11,300 GHz, τf= +24.7 ppm/℃. Interestingly, the 6MN-BTN + 1.5 wt% BCB ceramic showed better chemical compatibility with Ag. The proposed 6MN-BTN + 1.5 wt% BCB ceramic configuration could be regarded as a promising material for LTCC applications.
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