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- W2120400897 abstract "A (Mg,Nb)-citrate gel has been prepared by the solvent evaporation of mixed solution, which was made by dissolving Mg(NO3)2, NbCl5, and citric acid, and subsequently fired in the temperature range of 650~950 °C to yield columbite-phase MgNb2O6 precursor. The obtained citrate gel and the fired powders were characterized by TG/DT analysis, FT-IR spectrophotometer, XRD, particle size analyzer, and SEM. X-ray diffraction analysis indicated that the columbite-phase MgNb2O6 precursor was formed with the minor phases of Nb2O5 and Mg4Nb2O9 when the citrate gel was heat-treated. The citrate-gel derived columbite MgNb2O6 precursor was a finer and more reactive powder than that obtained by solid-state reaction as evidenced by its ability to react with PbO. The percent of per ovskite-phase Pb(Mg13Nb23)O3 in the calcined powders increased as the calcination temperature increased. Pb(Mg13Nb23)O3 ceramics fabricated from citrate-gel derived columbite MgNb2O6 precursor could be highly sintered at ca 850 °C. The maximum dielectric constant of Pb(Mg13Nb23)O3 ceramics was found to increase with the sintering temperature. The grain size dependence of dielectric constant can be explained as a consequence of low-permittivity grain boundaries." @default.
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- W2120400897 date "1998-01-01" @default.
- W2120400897 modified "2023-10-18" @default.
- W2120400897 title "Preparation of powder using a citrate-gel derived columbite MgNb2O6 precursor and its dielectric properties" @default.
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- W2120400897 doi "https://doi.org/10.1016/s0955-2219(97)00169-6" @default.
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