Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced electrical and electrocaloric properties in lead-free
  Ba0.8Ca0.2ZrxTi1-xO3 (x = 0 and 0.02) ceramics   The effects of 2% Zr introduction in Ba0.8Ca0.2TiO3 (BCT) system on its
electrical and the electrocaloric properties was investigated.

29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg