Preparation of REFeAsO1−F (RE=Sm and Gd) superconductors at a relatively low temperature
作者:Y.J. Cui、Y.L. Chen、C.H. Cheng、Y. Yang、Y.Z. Wang、Y.C Li、Y. Zhao
DOI:10.1016/j.jpcs.2010.10.041
日期:2011.5
relatively low temperature. The samples have been sintered at 1100 and 1120 °C for SmFeAsO 1− x F x and GdFeAsO 1− x F x , respectively. These temperatures are at least 50–60° lower than other previous reports. All of the so-prepared samples possess a tetragonal ZrCuSiAs-type structure. Dramatically supression of the lattice parameters and increase in T c proved that this low temperature process was
摘要 以纳米级 ReF 3 作为氟资源,在相对较低的温度下制备了一系列 SmFeAsO 1− x F x 和 GdFeAsO 1− x F x ( x =0.05, 0.1, 0.15, 0.2, 0.25) 样品. SmFeAsO 1− x F x 和 GdFeAsO 1− x F x 分别在 1100 和 1120 °C 下烧结样品。这些温度至少比之前的其他报告低 50–60°。所有如此制备的样品都具有四方 ZrCuSiAs 型结构。晶格参数的显着抑制和 T c 的增加证明这种低温过程更有效地将氟引入稀土 FeAsO 中。SmFeAsO 1− x F x 的超导转变出现在 39.5 K 处,x =0.05,而 GdFeAsO 1− x F x 出现在 22 K 处,x =0.1。检测到的最高 T c 在 SmFeAsO 0.8 F 0.2 中为 54 K,在 GdFeAsO 0.75 F