PREPARATION OF BI-ALKALINE EARTH ELEMENT-CU OXIDE BASED HIGH-TEMPERATURE SUPERCONDUCTING CERAMIC RAW MATERIAL POWDER

摘要

PURPOSE:To contrive a finer and more uniform particle diameter of a raw material powder, by blending a flux in a mixture of respective compounds of Bi, an alkaline earth element and copper in calcining the afore-mentioned mixture and preparing the subject raw material powder. CONSTITUTION:A mixture of a Bi compound, an alkaline earth element compound and copper compound is calcined to prepare a Bi-alkaline earth element-Cu oxide based superconducting ceramic raw material powder. In the process, the above-mentioned mixture is mixed with a flux. A compound, e.g., a halide of Na, K or Ba, meltable at the calcining temperature without decomposition is used as the flux. Since mutual fusion of formed particles formed by the calcination and growth into large particles are suppressed by this method, the aimed raw material powder having =1mu particle diameter and a uniform particle size distribution is obtained.