Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low symmetry phases in piezoelectric systems: PZN-xPT single crystal and
  powder   In this review we address some of the experimental challenges found in the
x-ray diffraction characterization of the low-symmetry phases recently
discovered in the PZT, PZN-PT and PMN-PT piezoelectric systems around their
morphotropic phase boundaries. In particular, we discuss the need for special
care in the preparation of powder samples made from single crystals in order to
avoid degradation and peak-broadening effects.

17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol