论文部分内容阅读
By laser heated pedestal growth method,Bi_2Sr_2CaCu_2O_(8+δ) as-grown fibers with differentmorphologies were solidified in non-equilibriumcondition at the rates of 0.1～14mm/min.At lowrates,a(Sr_(1-x)Ca_x)CuO_2 phase with long andstraight strips in shape and a white Cu-rich phasehaving a morphology of globular shape were found.With the increase of solidification rates,the phase(Sr_(1-x)Ca_x)CuO_2 becomes thinner and the Cu-richphase becomes smaller and dispersive.When thesolidification rates were last.another unstablephase(Sr_(1-x)Ca_x)Cu_2O_3 occurred.In fact,the tran-sition of the semiconductive as-grown fiber to thesuperconductor is a peritectoid reaction influencedby the annealing temperature and time.
By laser heated pedestal growth method, Bi_2Sr_2CaCu_2O_ (8 + δ) as-grown fibers with different morphologies were solidified in non-equilibrium condition at the rates of 0.1 ~ 14mm / min.At lowrates, a (Sr_ (1- x) Ca_x) with long and narrow strips in shape and a white Cu-rich phasehaving a morphology of globular shape were found. Since the increase of solidification rates, the phase (Sr_ (1-x) Ca_x) CuO_2 becomes thinner and the Cu-richphase becomes smaller and dispersive.When thesolidification rates were last.another unstablephase (Sr_ (1-x) Ca_x) Cu_2O_3 occurred.In fact, the tran-sition of the semiconductive as-grown fiber to the superconductor is a peritectoid reaction influenced by the annealing temperature and time.