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.

引用

页码：671 / 676

页数：6

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