Synthesis of bismuth HTSC homologues on seed crystals from precursors amorphous to X-rays

Bismuth HTSCs Bi2Sr2CaCu2Ox and Bi2Sr2Ca2Cu3Ox (hereafter, 2212 and 2223, r espectively) were manufactured from precursors that were amorphous to X-ray s (hereafter, amorphous precursors). The influence of a seed crystal (templ ate) on the crystallization and formation rate of the final product is stud ied. It is established that introducing seed crystals of the same compositi on into the amorphous precursors of Bi2Sr2CaCu2Ox and Bi2Sr2Ca2Cu3Ox enhanc es phase formation only within the region of the thermodynamic stability of the specified phases. It is also demonstrated that the strongest enhanceme nt of crystallization from amorphous precursors is caused by the template t hat is identical to the final crystalline product in chemical and phase com position.