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Growth from gas cavities in a molten salt and properties of superconducting Bi2Sr2CaCu2O8+delta single crystals

机译:熔融盐中气体腔的生长和Bi2Sr2CaCu2O8 +δ超导单晶的性质

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摘要

Perfect single crystals of the high-temperature superconductor Bi2Sr2CaCu2O8+delta with the super-conducting, transition temperature T-C = 72-85 K (depending on the crystallization conditions) are obtained by the method of free growth in gas cavities formed in a KCl solution-melt. The specific features of the growth process are in the formation of an enclosed growth gas cavity in a (previously synthesized) blend of a specified phase composition dissolved in KCl and the free crystal growth in this cavity. The combination of growth and high-temperature annealing in the same process made it possible to obtain uniform (DeltaT(C) = 1.5 K) single crystals with stable superconducting properties. Annealing of the grown single crystals in oxygen or in air in the temperature range 400-850degreesC confirmed that the crystals with maximum values of TC are optimally doped. (C) 2005 Pleiades Publishing, Inc.
机译:通过在KCl溶液中形成的气体腔中自由生长的方法获得具有超导转变温度TC = 72-85 K(取决于结晶条件)的高温超导体Bi2Sr2CaCu2O8 +δ的完美单晶。熔化。生长过程的特定特征是在(先前合成的)混合物中形成了一个封闭的生长气体腔,该混合物由溶解在KCl中的特定相组成和在该腔中的自由晶体生长组成。通过在同一过程中进行生长和高温退火相结合,可以获得具有稳定超导特性的均匀(DeltaT(C)= 1.5 K)单晶。在氧气或空气中在400-850摄氏度的温度范围内对生长的单晶进行退火,证实了具有TC最大值的晶体得到了最佳掺杂。 (C)2005年Pleiades Publishing,Inc.

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