Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Length-scale dependent average structures, piezoelectricity enhancement
  and depolarization mechanisms in a non-MPB high-performance piezoelectric
  alloy system PbTiO3-Bi(Zr1/2Ni1/2)O3   There is a general perception that large piezoelectric response in
ferroelectric alloys requires tuning the system towards a morphotropic phase
boundary (MPB), i.e., a composition driven inter-ferroelectric instability.
Here we show that high piezoelectric response can be realized even in non-MPB
alloy systems. This is demonstrated on (1-x)PbTiO3-(x)Bi(Zr0.5Ni0.5)O3 (PT-BNZ)
by a comprehensive study involving electric-field and temperature dependent
XRD, Raman spectroscopy, dielectric, piezoelectric and high field electrostrain
measurements. We found that poling-field irreversibly suppresses the cubic-like
phase at room temperature. Based on our results, we argue that that which
appears as MPB, comprising of tetragonal and cubic-like phases on the global
scale, is not so actually. The large piezoresponse is due to coexistence of
tetragonal regions of long and short-range coherence. The PT-BNZ system is
therefore qualitatively different from the conventional MPB systems such as
PZT, PMN-PT, and PbTiO3-BiScO3, etc., which exhibits coexisting tetragonal and
rhombohedral/monoclinic phases in thermodynamic equilibrium. In the absence of
inter-ferroelectric instability as a phenomenon, field induced
polarization-rotation and inter-ferroelectric transformation are no longer
plausible mechanisms to explain the large piezoelectric response in PT-BNZ. The
large piezoelectricity is primarily due to enhanced mobility of the tetragonal
domain walls enabled by domain miniaturization. Our study proves that
attainment of large piezoelectricity does not require inter-ferroelectric
instability as a necessary criterion.

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The categories of this paper are: math
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph