Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal conductivity of the A_xBO_2 type layered oxides Na_0.77MnO_2 and
  LiCoO_2   We prepared polycrystalline samples of the A_xBO_2 type layered oxides
Na_0.77MnO_2 and LiCoO_2, and measured thermal conductivity from 15 to 280 K.
Na0.77MnO_2 shows a low thermal conductivity of 15 mW/cmK, while LiCoO_2 shows
a much higher value of 40 mW/cmK at 280 K. By comparing them with the data of
NaCo_2O_4, we have found that the low thermal conductivity of A_xBO_2 comes
essentially from the A-ion deficiency, not from the layered structure itself.

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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn