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- W2022942904 abstract "Studies have been undertaken using thermal analysis, in conjunction with high-temperature and room temperature X-ray diffraction, fraction, to elucidate phase relationships during thermal processing of thick films of initially phase pure Bi2Sr2CaCu2Oy (2212) on silver substrates in various oxygen-containing atmospheres (0.001 to 100% O2). Exothermic events on cooling at 10°C/min from a partially liquid state vary with oxygen partial pressure and can be grouped into three sets (I–III). Set I is prominent for 0.001% and 0.1% O2 in the range of 740–775°C and is believed to be associated with the crystallization of a Cu-free ∼ Bi5Sr3Ca1 oxide phase. Set II results from the crystallization of 2212; it is observed for p(O2)≥1.0% in the temperature range 800–870°C. Set III appears for 21% and 100% O2 in the temperature range 880–910°C, and its origin is not clear from the results of this study. Subsequent room temperature X-ray diffraction from these samples suggests that in general high oxygen partial pressures (100% O2) tend to favor the formation of Bi2Sr2CuO6 (2201), whereas low oxygen partial pressures (0.001-0.1% O2) lead to the formation of a Cu-free, Bi-Sr-Ca oxide phase. The 2212 phase forms at this cooling rate predominantly for intermediate oxygen partial pressures (7.6–21% O2). High-temperature X-ray diffraction during cooling (2°C/h) from the partially liquid state shows a pronounced dependence of the order of evolution of crystalline 2212 and 2201 phases on p(O2). For an oxygen partial pressure of 1.0% the formation of 2212 precedes that of 2201, whereas for 0.01% O2 2201 crystallizes at a higher temperature than 2212. The implications of these results pertaining to thermal processing of thick 2212 films are discussed." @default.
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- W2022942904 date "1992-11-01" @default.
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- W2022942904 title "Phase development in the Bi2Sr2CaCu2Oy system" @default.
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- W2022942904 doi "https://doi.org/10.1016/0921-4534(92)90305-v" @default.
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