Bi1.7 Pb0.4 Sr1.6 Ca2.4 Cu3.6 Ox Alloy

Alloy name: Bi1.7 Pb0.4 Sr1.6 Ca2.4 Cu3.6 Ox
Diagram No.: 632
Type of diagram: TTT
Chemical composition in weight %: Bi 1.7Pb 0.4 Sr1.6 Ca2.4 Cu3.6 Ox.
Alloy group: Bismuth-based alloys
Note: TTT diagram in the solidification of the melt with a composition of Bi1.7 Pb0.4 Sr1.6 Ca2.4 Cu3.6 Ox.
Phase changes during the solidification of Bi-Pb-Sr-Ca-Cu-O melt were studied. Under solidification processes with constant cooling rates of 0.001-10 C/s, Bi2Sr2Ca2Cu3Ox(2223) is not formed but Bi2Sr2Ca2Cu3Ox(2212) and Bi2Sr2CuOx(2201) are observed. The time-temperature-transformation (TTT) diagram in the solidification of the melt is proposed based on the results of X-ray diffraction (XRD) analysis. A high-Tc superconductor phase of 2223 is formed through the isothermal treatment at 850 C for above 150 ks.The analyses of XRD and scanning electron micrograph (SEM) with energy dispersive X-ray (EDX) suggest that 2201 needles are crystallized at the interface between (Ca,Sr)2CuO3 crystals and melt, and the part of 2201 crystals transforms to 2212 and 2223 crystals by the diffusion of Ca, Sr, and Cu ions.
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