Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single crystal fiber growth of cerium doped strontium yttrate,
  SrY2O4:Ce3+   First single crystal fibers of cerium doped strontium yttrate are fabricated
using the laser-heated pedestal growth technique. Through thermodynamic
equilibrium calculations and by high-temperature mass spectrometry suitable
growth conditions can be determined. The atmosphere plays an important role
during crystallization. It affects the composition shift, on the one hand, and
the valence state of cerium, on the other hand. These properties can be
explained by combining X-ray diffraction, elemental analysis, and optical
spectroscopy. Crystallization in slightly reducing nitrogen atmosphere proves
to be a reasonable choice, because evaporation is suppressed and trivalent
cerium is stabilized. Strong green emission that depends on the oxygen fugacity
during crystallization can be excited using UV light. Optical transmission of
SrY2O4:Ce3+ is measured for the first time.

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The categories of this paper are: hep-ex
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The categories of this paper are: eess
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph