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- W2022812906 abstract "Two types of Bi-2212 single crystals, one type having a low Tc and the other having a high Tc were annealed in air at different temperatures over the range 450°C to 750°C followed by furnace cooling. The transition temperature of the crystals with low Tc (∼ 56 K) increased with increase of annealing temperature, while the crystals with high Tc (∼ 91 K) had just the opposite behaviour under the same annealing conditions. It is indicated that the quality of as-grown crystal has a significant effect on the superconducting properties of the annealed crystal. The c-axis values for both types of crystals decreased with increase of annealing temperature. According to the relationship between c-axis values and the oxygen content, our results confirmed the existence of a dome-shaped curve of Tc with carrier concentration in Bi-2212 single crystal similar to that in Bi-2212 compound reported previously by Groen and de Leeuw [Physica C 159 (1989) 417]. By studying the increase of annealing time at a Fixed temperature of 650°C, Tc and ΔTc were found to change very little for both types of crystals. Thus, Tc and ΔTc were more sensitive to annealing temperature than to annealing time. XRD, SEM and EDS revealed that a small quantity of powder phase appeared after annealing at temperatures above 500°C for both types of crystals. This powder phase had the Bi-2212 composition, which indicated that the integrity of the Bi-2212 single crystals was significantly degraded by the annealing process." @default.
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- W2022812906 date "1995-05-01" @default.
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- W2022812906 title "The effect of annealing on the superconducting properties and structure of Bi-2212 single crystals" @default.
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- W2022812906 doi "https://doi.org/10.1016/0921-4534(95)00137-9" @default.
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