Microwave dielectric properties of Na1/2Bi1/2Cu2.82Mn0.18Ti4O12ceramics

The microwave dielectric resonance properties of Na1/2Bi1/2Cu2.82Mn0.18Ti4O12 (NBCMTO) ceramics are reported. Single-phase NBCMTO powder were obtained from the mixed oxide route at 975°C and dense ceramics (~ 97% of the theoretical X-ray density) with a grain size distribution between ~ 2 and 10 μm by sintering in air at 1060°C. Ceramics exhibit room temperature microwave dielectric resonance with er ~ 130, Qf0 ~ 1750 GHz and a temperature co-efficient of resonance, τf, ~ +1000 ppm/K. The high permittivity and the large magnitude and sign of τf are attributed to incipient ferroelectricity.