Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electric Field Induced Phase Transition in KDP Crystal Near Curie Point:
  Raman and X-ray Scattering Studies   X-ray scattering measurements are performed in order to verify % that the
mechanism leading to the DC electric field induced $C_{2v}^{19} \to
C_{2v}^{\neq 19}$ phase transition in KDP crystal at 119 K is the changing of
the local sites symmetries of phosphate group from $C_2$ in the $C_{2v}^{19}$
phase to $C_s$ in the $C_{2v}^{\neq 19}$ phase. It is shown by analyzing the
integrated intensity of the (800) and (080) reflections that under DC electric
field the density of oxygen atoms lying on these plane changes indicating that
phosphate group rotates around the [010] direction relative to the orthorhombic
$C_{2v}^{19}$ structure. Some Raman results are also discussed.

37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess