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@ARTICLE{Rsche:640293,
      author       = {Rösche, Constanze Maria and Malcherek, Thomas and
                      Ballaran, Tiziana Boffa and Paulmann, Carsten and Angel,
                      Ross and Gorfman, Semen and Mihailova, Boriana},
      title        = {{S}tructural transformations in the
                      (1−$x$){N}a$_{0.5}${B}i$_{0.5}${T}i{O}$_3$−
                      $x${B}a{T}i{O}$_3$ solid solution under high pressure:
                      {C}omparison between x below and above the morphotropic
                      phase boundary},
      journal      = {Physical review / B},
      volume       = {112},
      number       = {18},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2025-04750},
      pages        = {184102},
      year         = {2025},
      abstract     = {Single crystals of
                      (1-$x$)Na$_{0.5}$Bi$_{0.5}$TiO$_3$-$x$BaTiO$_3$ (NBT-$x$BT)
                      with a composition below ($x=0.013$) and above ($x=0.074$)
                      the morphotropic phase boundary (MPB) were studied by $in
                      situ$ high-pressure x-ray diffraction with synchrotron
                      radiation and Raman spectroscopy. We show that both
                      compounds undergo a reversible pressure-induced phase
                      transition to structures with $Pnma$ symmetry, regardless of
                      their symmetry at ambient conditions. The high-pressure
                      phase resembles that recently reported for
                      $x_{\rm{MPB}}=0.048$, as the critical pressure $p_{\rm c}$
                      gradually increases with $x$. However, the pathway of
                      developing the high-pressure phase varies with the
                      composition, revealing distinct ways of Ba incorporation
                      into the NBT matrix for the pseudorhombohedral ($x=0.013$)
                      and tetragonal ($x=0.074$) phases. For $x$<$x_{\rm{MPB}}$
                      the Ba$^{2+}$ cations are preferentially accommodated in the
                      tetragonal-type nanodomains existing in the dominant
                      pseudorhombohedral NBT matrix, whereas for $x>x_{\rm{MPB}}$
                      Ba$^{2+}$ is dispersed in both the rhombohedral nanodomains
                      and the dominant tetragonal matrix. Furthermore, for
                      $x=0.074$ there are incommensurate structural modulations at
                      ambient pressure, which up to $p_c$ remain unaffected by
                      pressure, but vanish above $p_c$.},
      cin          = {U HH / DOOR ; HAS-User / UBT},
      ddc          = {530},
      cid          = {$I:(DE-H253)U_HH-20120814$ / I:(DE-H253)HAS-User-20120731 /
                      I:(DE-588)1029605-0},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3) / FS-Proposal: I-20220769
                      (I-20220769)},
      pid          = {G:(DE-HGF)POF4-6G3 / G:(DE-H253)I-20220769},
      experiment   = {EXP:(DE-H253)P-P24-20150101 /
                      EXP:(DE-H253)P-P02.2-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/p74j-3j8p},
      url          = {https://bib-pubdb1.desy.de/record/640293},
}