Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental evidence for pressure-induced first order transition in
  cerium nitride from B1 to B10 structure type   The crystal structure of CeN was investigated up to pressures of 82 GPa,
using diamond anvil cell powder X-ray diffraction in two experiments with He
and Si-oil as the pressure transmitting media. In contrast to previous reports,
we do not observe the B2 (CsCl type) structure at high pressure. Instead, the
structural phase transition, starting at 65 GPa, from the ambient rock salt B1
structure results in a distorted CsCl-like B10 structure, irrespective of the
pressure medium. Our result unambiguously confirms two recent density
functional theory (DFT) studies predicting the B10 phase to be stable at these
pressures, rather than the B2 (CsCl type) phase previously reported. The B10
structure appears to approach the B2 structure as pressure is increased
further, but DFT calculations indicate that an L1 0 structure (AuCu type) is
energetically favored.

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The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th