Abstract
Ba(Zn1/3Ta2/3)O3 microwave ceramics with sub-micron sized grains (<300 nm) and high sintering density (>98%) are synthesized by spark plasma sintering (SPS) with significantly reduced sintering temperature (1300–1450 °C) and a very short sintering time (15 min) under 30 MPa applied pressure. Raman spectra suggest that B-site short-range 1:2 ordering is present in SPS-ed Ba(Zn1/3Ta2/3)O3 ceramics, but it occurs on length scales that are not detectable by XRD. The density, 1:2 ordering, and Q × f values of Ba(Zn1/3Ta2/3)O3 ceramics are highly sensitive to sintering temperature rather than applied pressure. The Q × f values of SPS-ed Ba(Zn1/3Ta2/3)O3 ceramics increase with annealing time. The Q × f value of SPS-ed Ba(Zn1/3Ta2/3)O3 ceramics at 1400 °C for 15 min with 50 Mpa applied pressure is further improved to ~39 865 GHz by annealing at 1200 °C for 20 h in O2.
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