Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stabilization mechanism of tetragonal structure in hydrothermal
  synthesized BaTiO$_3$ nanocrystal   Higher OH concentration is identified in tetragonal barium titanate
(BaTiO$_3$) nanorods synthesized by a hydrothermal method with 10 vol% ethylene
glycol solvent [Inada, M. $et$ $al$. $Ceram.$ $Int.$ $2015$, $41$, 5581-5587].
This is apparently inconsistent with the known fact that higher OH
concentration in the conventional hydrothermal synthesis makes pseudo-cubic
BaTiO$_3$ nanocrystals more stable than the tetragonal one. To understand where
and how the introduced OH anions are located and behave in the nanocrystals, we
applied $ab$ $initio$ analysis to several possible microscopic geometries of OH
locations, confirming the relative stability of the tetragonal distortion over
the pseudo-cubic one due to the preference of trans-type configurations of OH
anions. We also performed FTIR and XRD analysis, all being in consistent with
the microscopic picture established by the $ab$ $initio$ geometrical
optimizations.

20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs