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옥살산염 공침법으로 합성한 BaCe_0.9Gd_0.1O_2.95 분말 전구체의 열분해 특성
沈秀萬,錢亮汐 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-
BaCe_0.9Gd_0.1O_2.95 powder was synthesized from the solutions of Ba, Ce, and Gd nitrates by oxalate coprecipitation method. Thermal behavior of the powder precursor oxalate coprecipitate, was investigated using TG/DTS and XRD. The addition of an oxalic acid solution of which pH had been adjusted to 4 with NH_4ON, to a mixture of the nitric solutions yielded coprecipitates having a stoichiometric composition. The addition of an oxalic acid solution without adjusting Ph, however, failed to produce the stoichiometric composition, because all Ba ions did not precipitate. The oxalate copercipitate obtained at pH 4 was completely decomposed into BaCO_3, CeO_2, and Gd_2O_3 at ∼480℃, resulting in single phase BaCe_0.9Gd_0.1O_2.95 powder after calcination at 1000℃. The composition of the calcined powder was found to be uniform and coincide with the original composition of the starting solution.