Abstract
A synthetic procedure has been developed for the (Pb0.45Ca0.55)(Fe1/2Nb1/2)O3 (PCFN) system in terms of liquid-mixed citrate precursor. The stability of the citrate gels against phase separation is investigated as a function of the pH value and the citrate/metal ratio in the initial solution. The elaboration process is described in detail. A single-phase PCFN powder with a particle size of 30–50 nm can be synthesized at the low temperature of 850 °C using the citrate-gel processing route, which is 200 °C lower than that for the conventional process. Sintering properties and microwave dielectric properties of specimens derived from the citrate-gel process were also studied in this paper. A dense compound with a bulk density up to 6.20 g cm-3 could be obtained when the specimens are sintered at 1000 °C/4 h. The dense single-phase PCFN ceramics were found to have microwave dielectric properties of ɛγ=86.2, Q · f=3450 GHz and τf=4 ppm°C-1.
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