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@ARTICLE{Pandey:906371,
      author       = {Pandey, Gaurav Chandra and Su, Yixi and Rath, Chandana},
      title        = {{S}tructural {T}ransformations and {M}agnetic {P}roperties
                      of {M}ixed {S}pinel‐{T}ype
                      {N}i{C}r$_{1.7}${F}e$_{0.3}${O}$_4$ {N}anoparticles},
      journal      = {Physica status solidi / B},
      volume       = {258},
      number       = {11},
      issn         = {0370-1972},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2022-01400},
      pages        = {2100284 -},
      year         = {2021},
      abstract     = {Structural and magnetic properties of NiCr1.7Fe0.3O4
                      nanoparticles, synthesized by a facile coprecipitation
                      method, are examined using temperature-dependent X-ray
                      diffraction, neutron scattering with XYZ polarizations, and
                      magnetic measurements. The structural analysis demonstrates
                      the stabilization of the cubic phase down to 200 K,
                      followed by a low-temperature tetragonal phase at 100 K
                      and an orthorhombic phase below 50 K. The refined
                      occupancies of cations demonstrate that the NiCr1.7Fe0.3O4
                      is a mixed spinel compound, wherein B sites are populated by
                      $≈85\%$ Cr3+ and $≈15\%$ Ni2+ cations and A sites are
                      populated by $≈70\%$ Ni2+ and $≈30\%$ Fe3+ cations. As a
                      consequence, the reduction in the occupancy of Jahn–Teller
                      active Ni2+ (triply degenerate: e4 t4) at A site is
                      attributed to the stabilization of the cubic phase below
                      room temperature. Temperature-dependent magnetization and
                      neutron scattering with XYZ polarizations measurements
                      reveal the ferrimagnetic nature of the magnetic phase and
                      the absence of spin-spiral ordering in NiCr1.7Fe0.3O4
                      nanoparticles. Furthermore, field-dependent magnetization
                      measurement demonstrates an exchange bias field of
                      ≈134.5 kA m−1 at 5 K. The training effect
                      measurement is performed to discuss the origin of exchange
                      bias based on different phenomenological models such as
                      power-law and multiexponent models.},
      cin          = {JCNS-FRM-II / MLZ / JCNS-2 / JCNS-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)JCNS-4-20201012},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)DNS-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000695092500001},
      doi          = {10.1002/pssb.202100284},
      url          = {https://juser.fz-juelich.de/record/906371},
}