Barium Carbonate Powder
PartSupplies the barium for YBa2Cu3O7 and releases CO2 as it decomposes during calcination. Buy 99.9% or better on a metals basis and allow about 0.6 g per gram of YBa2Cu3O7, the largest share of any precursor by mass. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.