Modified Solution-Sol-Gel Process to Synthesize Ultrafine BiPbSrCaCuO Powder with Low Carbon Content

摘要

A modified Solution-Sol-Gel (SSG) process is presented to synthesize homogeneous and ultrafine BiPbSrCaCuO precursor powders based on the application of solution Self-propagting High-temperature Synthesis (SHS). The modifined process includes two steps. First, homogeneous wet gel is prepared by optimized citrate process. Second, wet gel is ignited at thigh temperature to get BiPbSrCaCuo powders wit main phase compositions of 2212 phase, (Ca,Sr)_2PbO_4 and CuO. The effects of process parameters on homogeneity of wet gel are systematically studied. The new process presents a quick way to synthesize homogeneous and ultrafine BiPbSrCaCuO powder with low carbon content (approx200ppm) Highly pure 2223 phase can be prepared from the newly processed powders.