Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elastic aging from coexistence and transformations of ferroelectric and
  antiferroelectric states in PZT   Materials undergoing antiferroelectric/ferroelectric (AFE/FE) transitions are
studied for possible applications that exploit the large volume, charge and
entropy differences between the two states, such as electrocaloric cooling,
energy storage, electromechanical actuators. Though certain compositions of PZT
codoped with La and Sn may withstand millions of electrically induced AFE/FE
cycles, in other cases few thermally induced cycles and room temperature aging
may cause noticeable changes in the material properties. This is particularly
evident in the elastic moduli, which at room temperature can become as much as
four times softer. In order to get more insight into the mechanisms involved in
such elastic aging and full recovering with mild annealing at 600-800 K, the
effect of La doping on PZT with 4.6% Ti is studied with anelastic measurements.
Complete suppression of the time dependent phenomena is found after the
transformation of the intermediate FE phase into incommensurate AFE by 2% La
doping. This is discussed in terms of disappearance of the stress and electric
fields at the FE/AFE interfaces, in the light of the thermally activated
anelastic relaxation processes that are observed at high temperature, and are
due to mobile defects, presumably O vacancies.

5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th