Microwave dielectric properties of NaMgF3 ceramic

Abstract

Microwave dielectric properties of NaMgF3 ceramics prepared by reactive sintering (RS) and conventional sintering (CS) processes have been reported in this paper. Phase pure NaMgF3 ceramics with relative densities of ∼95% could be obtained at 800–950 °C/2h by both sintering processes. The RS sample demonstrates lower sintering activation energy and a much large grain size compared with the CS sample. Both densified samples exhibit similar microwave dielectric properties: εr ∼ 6.9, Q × f value ∼63000 GHz, and τf ∼ −114 ppm/°C. However, the large negative τf value needs to be further improved for practical applications.