Glass and glass-ceramic obtained in the doped Bi-Sr- Ca-Cu-O system. Early stage of crystallization

摘要

The glass forming ability and the early stage ofthe crystallization process in the Bi-Sr-Ca-Cu-O system dopedwith PbO and B_2O_3 has been investigated. The presence ofdopants, oxides with low melting points, enhanced glassforming ability and stability. It should be point out that a strictcontrol of the parameters as presence and nature of dopants,heating rate and sequences of annealing treatment, thatinfluenced the early stage of crystallization process is desirable.