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- W1991090094 abstract "A barium titanate precursor with a barium:titanium ratio of 1:4 was prepared by controlled coprecipitation of mixed barium and titanium species with an ammonium oxalate aqueous solution at pH 7. The results of thermal analysis and IR measurement show that the obtained precursor is a mixture of BaC2O4·0.5H2O and TiO(OH)2·1.5H2O in a molar ratio of 1:4. Crystallized BaTi4O9 was obtained by the thermal decomposition of a precipitate precursor at 1300°C for 2 h in air. The dimensions of the powder calcined at 1000°C are between 100 and 300 nm. The grain dimensions of the sintered sample for 2 h at 1300°C are of the order of 10 to 30 μm. Dielectric properties of disk-shaped sintered specimens in the microwave frequency region were measured using the TE011 mode. Excellent microwave characteristics for BaTi4O9—ɛ= 38 ± 0.5, Q= 3800–4000 at 6–7 GHz and τf= 11 ± 0.7 ppm/°C—were found." @default.
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- W1991090094 date "2004-12-20" @default.
- W1991090094 modified "2023-10-14" @default.
- W1991090094 title "Preparation of BaTi4O9 from Oxalates" @default.
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- W1991090094 doi "https://doi.org/10.1111/j.1151-2916.2002.tb00122.x" @default.
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