Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New phases in the Ba-Ce(M)-O systems (M = Ga, In)   A new and known barium cerates doped by In and Ga were synthesized in air at
1700 K. The synthesis was performed by solid state reactions from BaCO3, CeO2,
In2O3 or Ga2O3. X-ray diffraction profiles of the powdered samples were
obtained with DRON-UM-1 and STADI-P diffractometers using monochromatized CuKa
radiation. The following compositions of new phases were obtained:
BaCe1-xGaxO3-d (x = 0.05; 0.1) and BaCe1-xInxO3-d (x = 0.25, 0.5). They
crystallize in the orthorhombic space group Pnma. The lattice parameters were
calculated by full profile Rietveld method. Based on analysis of literature
data it was possible to assume that increasing of tolerance factors from BaCeO3
up to BaCe1-xGaxO3-d (BaCe1-xInxO3-d) led to the increasing of stability and
transport properties of Ga and In doped barium cerates.

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The categories of this paper are: eess
13
The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph