Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature Driven Structural Phase Transition in Tetragonal-Like BiFeO3   Highly-strained BiFeO3 exhibits a "tetragonal-like, monoclinic" crystal
structure found only in epitaxial films (with an out-of-plane lattice parameter
exceeding the in-plane value by >20%). Previous work has shown that this phase
is properly described as a M$_{C}$ monoclinic structure at room temperature
[with a (010)$_{pc}$ symmetry plane, which contains the ferroelectric
polarization]. Here we show detailed temperature-dependent x-ray diffraction
data that evidence a structural phase transition at ~100C to a high-temperature
M$_{A}$ phase ["tetragonal-like" but with a (1-10)$_{pc}$ symmetry plane].
These results indicate that the ferroelectric properties and domain structures
of strained BiFeO$_3$ will be strongly temperature dependent.

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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: q-fin