Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-pressure synthesis of boron-rich chalcogenides B12S and B12Se   Two boron-rich chalcogenides B12S and B12Se isostructural to
{\alpha}-rhombohedral boron were synthesized by chemical reaction of the
elements at high-pressure - high-temperature conditions. The crystal structures
and stoichiometries of both compounds were confirmed by Rietveld refinement and
elemental analysis. The experimental Raman spectra of B12S and B12Se were
investigated for the first time. All observed Raman bands have been attributed
to the theoretically calculated phonon modes, and the mode assignment has been
performed.

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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph