Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Space group symmetries of the phases of (Pb0.94Sr0.06)(ZrxTi1-x)O3
  across the antiferrodistortive phase transition in the composition range
  0.620<x<0.940   The existing controversies about the space group symmetries of Pb(ZrxTi1-x)O3
(PZT) above and below antiferrodistortive (AFD) phase transition temperature
(TAFD) in the Zr4+- rich (0.620<x<0.940) compositions are addressed using the
results of dielectric, synchrotron x-ray powder diffraction (SXRPD) and neutron
powder diffraction (NPD) studies. These compositions undergo an AFD phase
transition above room temperature due to tilting of oxygen octahedral leading
to a superlattice phase of PZT. We have substituted 6% Sr2+ at Pb2+-site to
enhance the tilt angle and thereby the intensity of the superlattice peaks. The
real and imaginary parts of complex dielectric permittivity have been used to
locate the paraelectric to ferroelectric and ferroelectric to AFD phase
transitions. Rietveld analysis of SXRPD and NPD profiles unambiguously reject
the rhombohedral phases in R3c and R3m space groups below and above TAFD,
respectively, with or without a coexisting monoclinic phase in Cm space group,
and confirm that the true symmetries are monoclinic in Cc and Cm space groups
below and above TAFD, respectively. Based on these and previous findings a
phase diagram of PSZT for 0.40<x<0.90 showing stability fields of monoclinic Cc
and monoclinic Cm, tetragonal P4mm and cubic Pm3m phases has also been
presented.

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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: math
0
The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys