Various Arsenic Network Structures in 112-Type Ca1-xLaxFe1-yPdyAs2 Revealed by Synchrotron X-ray Diffraction Experiments.
Various Arsenic Network Structures in 112-Type Ca1-xLaxFe1-yPdyAs2 Revealed by Synchrotron X-ray Diffraction Experiments.
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DOI：
10.1021/acs.inorgchem.6b03115
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发表时间：
2017-02
影响因子：
4.6
通讯作者：
S. Tamura;N. Katayama;Yuto Yamada;Y. Sugiyama;Kento Sugawara;H. Sawa
中科院分区：
文献类型：
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作者：
S. Tamura;N. Katayama;Yuto Yamada;Y. Sugiyama;Kento Sugawara;H. Sawa
采用同步辐射X射线衍射和X射线吸收近边结构（XANES）实验，合成并鉴定了两种新型112型钯掺杂铁砷化物。在112型超导铁砷化物Ca 1-xLaxFeAs 2中发现了面内砷锯齿链，其最大Tc = 34 K，而在其它112型材料中出现了变形的砷网络结构，如CaFe 1-yPdyAs 2中的纵向砷锯齿链（y ≤ 0.51）和Ca_（1-x）LaxFe_（1-y）PdyAs_2（x ≤ 0.31，y ≤ 0.30）中砷通过高价键形成的正方形片层。由于K边XANES光谱澄清了FeAs 4四面体周围类似的氧化状态，暗示了高Tc 112型铁砷化物超导体的可能母体。
Two novel 112-type palladium-doped iron arsenides were synthesized and identified using comprehensive studies involving synchrotron X-ray diffraction and X-ray absorption near-edge structure (XANES) experiments. Whereas in-plane arsenic zigzag chains were found in the 112-type superconducting iron arsenide Ca1-xLaxFeAs2 with maximum Tc = 34 K, deformed arsenic network structures appeared in other 112-type materials, such as longitudinal arsenic zigzag chains in CaFe1-yPdyAs2 (y ∼ 0.51) and arsenic square sheets constructed via hypervalent bonding in Ca1-xLaxFe1-yPdyAs2 (x ∼ 0.31, y ∼ 0.30). As K-edge XANES spectra clarified the similar oxidization states around FeAs4 tetrahedrons, alluding to possible parents for high-Tc 112-type iron arsenide superconductors.