Abstract
Ba0.55Sr0.45TiO3/MgO ceramic composites with 50wt% MgO content were studied in terms of the phase distribution, microstructure and electric properties, prepared by traditional ceramic process-solid phase synthesis. The results show that a small amount of Mg2+ ions have entered BSTO lattices to substitute for Ti4+ and behave as electron acceptors, contributing to the decrease of the dielectric loss. Ba0.55 Sr0.45TiO3/MgO composites in the paraelectric state at room temperature still have a high tunability because of a field-induced hardening of the soft phonon and the presence of micro- or nano-polar phases in the paraelectric phase. For Ba0.55Sr0.45TiO3/MgO ceramic composites, the microwave loss at 2.5 GHz is 7.1 × 10−3 and the value of tunability is 13.8% with the external DC field 4 kV ⋅ mm−1. It can basically meet the requirements of phase shifters working at microwave frequencies. The phase shift of 122∘ was obtained at 9.2 GHz using the designed phase shifter with the bias voltage 2 kV ⋅ mm−1.
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