Synthesis, crystal structure and magnetism of Eu3Sc2O5Fe2As2

被引：4
作者：
Hummel, Franziska [1 ]
Tegel, Marcus [2 ]
Gerke, Birgit [3 ]
Poettgen, Rainer [3 ]
Johrendt, Dirk [1 ]
机构：
[1] Univ Munich, Dept Chem, D-81377 Munich, Germany
[2] Fraunhofer Fertigungstech & Angew Mat Forsch IFAM, D-01277 Dresden, Germany
[3] Univ Munster, Inst Anorgan & Analyt Chem, D-48149 Munster, Germany
来源：
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 2015年 / 70卷 / 09期
关键词：
crystal structure; Eu-151 Mossbauer spectroscopy; europium; iron arsenide; magnetic properties; SUPERCONDUCTIVITY; MOSSBAUER;
D O I：
10.1515/znb-2015-0087
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The iron arsenide Eu3Fe2O5Fe2As2 was synthesized at 1173-1373 K in a resistance furnace and characterized by X-ray powder diffraction with Rietveld analysis: Sr3Fe2O5Cu2S2 type, I4/mmm, a = 406.40(1) pm, c = 2646.9(1) pm. Layers of edge-sharing FeAs4/4 tetrahedra are separated by perovskite-like oxide blocks. No structural transition occurs in the temperature range from 10 to 300 K. Magnetic measurements have revealed Curie-Weiss behavior with an effective magnetic moment of 7.79 mu(B) per europium atom in agreement with the theoretical value of 7.94 mu(B) for Eu2+. A drop in the magnetic susceptibility at 5 K indicates possible antiferromagnetic ordering. Eu-151 and Fe-57 Mossbauer spectroscopic measurements have confirmed a beginning cooperative magnetic phenomenon by showing significantly broadened spectra at 4.8 K compared to those at 78 K.
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页码：671 / 676
页数：6
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