Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: M\"ossbauer and X-ray Photoelectron Spectroscopy Studies of Fe2BiMO7 (M
  = Sb, Ta) pyrochlore compounds synthesized by molten salts method   Polycrystalline samples of Fe2BiMO7 (M = Sb, Ta) compounds with
pyrochlore-type structure were synthesized for the first time by the molten
salts method. The compounds were obtained in one hour at 950 C. The structures
were determined by Rietveld refinement. Through M\"ossbauer spectroscopy and
X-ray photoelectron spectroscopy, the site occupancies and ionic states of the
cations in the pyrochlore structure were investigated.Polycrystalline samples
of Fe2BiMO7 (M = Sb, Ta) compounds with pyrochlore-type structure were
synthesized for the first time by the molten salts method. The compounds were
obtained in one hour at 950 C. The structures were determined by Rietveld
refinement. Through M\"ossbauer spectroscopy and X-ray photoelectron
spectroscopy, the site occupancies and ionic states of the cations in the
pyrochlore structure were investigated.

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The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ