Study of Fe addition on the thermal decomposition of coprecipitated oxalates for the Bi-based superconductor synthesis

This work introduces results obtained during the preparation of a Bi-based material with superconducting properties by oxalate coprecipitation. The influence of Fe presence on the precursors thermal stability and on the superconducting phases formation mechanism are presented. The thermal deco mposition and the stability in air of FeC2O4. 2H(2)O and also of the compon ents mixture were studied by DTA/TG. It was evidenced that iron oxalate dec omposes at the lowest temperature compared to the decomposition temperature s of the individual oxalates. XRD, IR and TEM/ED studies were approached to investigate the individual ox alates and the mixture coprecipitates for the high-T-c superconducting mate rial synthesis.