Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Synthesis, Crystal Structure and Magnetism of Eu3Sc2O5Fe2As2   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 muB per europium atom in agreement with the
theoretical value of 7.94 muB for Eu2+. A drop in the magnetic susceptibility
at 5 K indicates possible antiferromagnetic ordering. 151Eu and 57Fe
M\"ossbauer 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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The categories of this paper are: quant-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg