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Preparation of High‐T c Superconducting Oxides by the Amorphous Citrate Process
Author(s) -
Chu Chungtse,
Dunn Bruce
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb04924.x
Subject(s) - thermogravimetric analysis , amorphous solid , decomposition , yield (engineering) , oxide , materials science , superconductivity , phase (matter) , thermal decomposition , x ray crystallography , high temperature superconductivity , diffraction , chemical process of decomposition , nuclear chemistry , chemical engineering , inorganic chemistry , chemistry , crystallography , metallurgy , organic chemistry , physics , quantum mechanics , optics , engineering
The high‐T c superconducting oxide Yba 2 Cu 3 O 7–y has been prepared by the amorphous citrate process. A citrate‐nitrate solution was prepared at room temperature and dehydrated at around 80°C to yield a solid precursor material. The precursor was fired to high temperature to form the desired compound. The decomposition mechanism was studied with thermogravimetric analysis and X‐ray diffraction. Intermediate products were formed during the decomposition reactions. Nearly phase‐pure Yba 2 Cu 3 O 7‐y powders were obtained by firing the precursor in air to 900°Cfor2 h. Sintered samples were typically over 90% dense and exhibited good superconducting properties.