Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High temperature oxygen NEXAFS valence band spectra and conductivity of
  LaFe3/4Ni1/4O3 from 300 K to 773 K   LaFe3/4Ni1/4O3 was subjected to oxygen near edge x-ray absorption fine
structure (NEXAFS) spectroscopy for 300 K < T < 773 K. The spectra show in the
pre-edge a small hole doped peak originating from Ni substitution. The relative
spectral weight of this transition to the weight of the hybridized O(2p) -
Fe(3d) transitions scales with T and has a maximum at around 600 K. The
characteristic energies of the thermal activated spectral intensity and
conductivity suggest that the concentration of charge transferred electrons
from O(2p) to Ni(3d) increases and that the pre-edges account in part for the
polaron activated transport.

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The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ