Preparation of Zn<sub>3</sub>Nb<sub>2</sub>O<sub>8</sub> by Chemical Co-Precipitation

Fine powder of Zn3Nb2O8 was prepared by chemical co-precipitation using KOH, Nb2O5 and ZnSO4·7H2O as raw materials. Laser particle analyzer was used to investigate the precursor. It showed that the average size (D50) was 3.13μm, and the particle distribution ranged from 1.82µm to 4.47µm. TG-DTA and XRD showed that, the precursor yielded Zn3Nb2O8 ceramics by calcined at 850°C, which was much lower than 1100°C, at which Zn3Nb2O8 ceramics could be obtained by traditional solid state method. The sintering of as-obtained powers with Cuo-Bi2O3-V2O5 sintering aids results in producing Zn3Nb2O8 ceramics with s density 94.20% of the theoretical, and a product up to 19.83 (at 30MHz) at sintering temperature 950°C.