WDX-Analysis of the New Superconductors RO1-x F x FeAs and Its Consequences on the Electronic Phase Diagram
WDX-Analysis of the New Superconductors RO1-x F x FeAs and Its Consequences on the Electronic Phase Diagram
复制标题
DOI：
10.1007/s10948-009-0478-5
复制
发表时间：
2009-08-01
影响因子：
1.8
通讯作者：
Behr, Gunter
中科院分区：
文献类型：
--
作者：
Koehler, Anke;Behr, Gunter
用波长色散x射线能谱（WDX）在电子显微镜下研究了RO1-x F (x) FeAs (0a份/千货币符号xa份/千货币符号0.25)（R=La, Sm, Gd）的多晶样品，以确定样品的组成，特别是氟含量。结果发现，测得的氟含量与初始重量有很大的偏差。在镧化合物la1 -x F (x) FeAs中，我们发现了良好的一致性，主要是xa份/千yen0.05，但当x < 0.05时，氟几乎没有进入样品。对于钐化合物，我们在所有氟浓度的初始称重中测量到的氟不到样品中的一半。在绘制la1 -x F (x) FeAs和SmO1-x F (x) FeAs的电子相图时考虑了这些测量值。与初始权重图相比，这导致两个图的图像更加一致。
Polycrystalline samples of RO1-x F (x) FeAs (0a parts per thousand currency signxa parts per thousand currency sign0.25) (R=La, Sm, Gd) were investigated by wavelength-dispersive X-ray spectroscopy (WDX) in the electron microscope to determine the composition of the samples, in particular the fluorine content. It was found that the measured fluorine content can deviate considerably from the initial weight. In the lanthanum compound LaO1-x F (x) FeAs, we found good agreement mainly for xa parts per thousand yen0.05, but for x < 0.05 the fluorine hardly goes into the sample. For the samarium compound we measured less than half the fluorine in the sample as initially weighed at all fluorine concentrations. These measured values are taken into account when drawing the electronic phase diagrams of LaO1-x F (x) FeAs and SmO1-x F (x) FeAs. This leads to a more consistent picture of both of the diagrams in comparison to the plot of the initial weight.