水溶性キレート錯体を用いたLa_xY_<1-x>Ba_2Cu_3O_y微粒子の合成と生成過程

概要

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La_xY_<1-x>Ba_2Cu_3O_y powders were synthesized by the aqueous chelate-mix technique using ethylenediamine-tetra-acetic acid(EDTA), nitrilo-tri-acetic acid(NTA)and imino-di-acetic acid(IDA)as chelating agents. The intermediate products obtained in each formation process were investigated by thermogravimetry, X-ray diffraction technique and infrared spectroscopy. It was found that the formation of the 123 phase from precursor-gel proceeds in the following four steps;(1)decomposition of ammonium acetate and Cu-EDTA and formation of metal-copper at 120〜220℃, (2)decomposition of carboxyl group of chelate at 340〜410℃, (3)combustion of the residual organics and formation of BaCO_3 and other oxides at 410〜480℃, and (4)decomposition BaCO_3 and formation of 123 phase around 800℃.
社団法人日本材料学会の論文
1997-07-15