快速加热法制备（Ba1-x Kx）Fe2As2单晶的自发化学计量变化
Spontaneous stoichiometry change in a single crystal of (Ba1-x Kx)Fe2As2 produced by rapid heating method
摘要：
为了防止Ba_（1-x）K_xFe_2As_2单晶生长过程中K的损失，我们发展了一种快速加热的Sn助熔剂法。获得了最佳超导转变温度TC约为38 K的大单晶，并对其结构、化学和超导性能进行了研究。此外，还研究了不同温度下生长后退火对晶体生长的影响。扫描电子显微镜微探针研究的样品与Ba.25 K.75 Fe 2 As 2的组合物的目标揭示了一个尖锐的分离的两个阶段的组合物，是建议合理的比例的K和Ba含量。
英文摘要：
To prevent the loss of K in growing single crystals of Ba1-x Kx Fe2 As2 we developed a rapid heating Sn-flux method. Large single crystals with the optimal superconducting transition temperature TC about 38K were obtained and their structural, chemical and superconducting properties were investigated. Additionally, the effect of post growth annealing at different temperatures were also examined on these crystals. Scanning electron microscopy microprobe studies on a samples with the composition goal of Ba.25 K.75 Fe2 As2 revealed a sharp separation of two phases with compositions that are suggestive rational ratios of the K and Ba content.
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