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A chelating sol–gel method was used for the preparation of the superconducting Bi-2223 phase. We compared pH range of both solution and gel stability in samples with EDTA, TEA and their equimolar mixture addition. A pH range of stability (for precipitation) was extended in EDTA solutions with addition of TEA. IR spectroscopy was used to identify the type of bonding between EDTA and TEA in a stabilized...
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