Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deep insights into the local structure of amorphous Ta2O5 thin films by
  X-ray pair distribution function analysis   Amorphous films of tantalum oxide (Ta2O5) are widely applied to build highly
reflective mirrors used in interferometric gravitational wave detectors, such
as the Laser Interferometer Gravitational Wave Observatory (LIGO). Despite a
large number of studies, the structural properties of amorphous Ta2O5 at the
local scale still deserve several further investigations. Such information is
essential to any attempt to understand the properties of this important
material and no property modelling efforts can be expected to yield reliable
information until the local structure in the amorphous phase is better
understood. In this paper we report the results obtained by analysing the
synchrotron X-ray pair distribution functions of pure and Ti-doped amorphous
Ta2O5 film, deposited by ion beam sputtering, as prepared and after a thermal
treatment. As a result, it is found that 1) the arrangement of Ta atoms in
amorphous Ta2O5 strongly resembles that characterizing the high-pressure
Z-Ta2O5 polymorph, whereas the topological properties of O atoms resembles that
observed in delta-Ta2O5; 2) structural correlations in amorphous Ta2O5 start to
vanish above ~ 5 Angstrom and are completely suppressed for r > 10 Angstrom on
account of disorder; 3) Ti substitution retains the short-range topological
ordering characterizing the as prepared Ta2O5 amorphous film even after thermal
treatment; conversely, pure Ta2O5 films undergoes a significant rearrangement
of the local structure after thermal treatment.

32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin