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@ARTICLE{Rok:863686,
      author       = {Rok, Magdalena and Bator, Grazyna and Zarychta, Bartosz and
                      Dziuk, Błażej and Skalecki, Damian K. and Medycki,
                      Wojciech and Zamponi, Michaela},
      title        = {{S}creening ferroelastic transitions in switchable
                      cyano-bridged perovskites: [{CH}3{C}({NH}2)2]2[{KM}({CN})6],
                      {M} = {C}r3+, {F}e3+, {C}o3+. {C}rystal structure
                      characterisation, dielectric properties, 1{H} {NMR} and
                      quasielastic neutron scattering studies.},
      journal      = {Crystal growth $\&$ design},
      volume       = {19},
      number       = {8},
      issn         = {1528-7505},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2019-03692},
      pages        = {4526-4537},
      year         = {2019},
      abstract     = {Here we report the dynamics of organic cations as guest
                      molecules in the novel perovskite host framework. The novel
                      switchable crystals from the coordination family
                      [CH3C(NH2)2]2[KB″(CN)6] were constructed by employing
                      acetamidinium cations (ACE = [CH3C(NH2)2]) as A-site and
                      B″: Cr3+, Fe3+, Co3+ in the inorganic cage. The molecular
                      motion of ACE+ as well as the effect of the trivalent
                      metallic cation type on two-step transitions were studied
                      using a combination of experimental methods: (i) X-ray
                      diffraction experiments, (ii) thermal analysis, (iii)
                      dielectric and electric studies, (iv) optical observations,
                      (v) 1H NMR spectroscopy, and (vi) quasielastic neutron
                      scattering (QENS). On the basis of the X-ray analysis,
                      transitions occur from a frozen-order phase (III,
                      monoclinic, C2/m) to an in-plane rotational disorder state
                      (II, trigonal, R3̅m) and to a melt-like disorder one (I,
                      cubic, Fm3̅m). A markedly temperature-dependent dielectric
                      constant indicates the tunable and switchable properties of
                      all complexes. The QENS, as well as 1H NMR spectroscopy,
                      were applied to measure the dynamics of the organic cations
                      residing in the inorganic framework. The ferroelastic nature
                      of the phases III and II were proven based on the polarized
                      light microscopy photographs. Also, the modified equation of
                      the tolerance factor t was used to estimate the theoretical
                      phase transition temperatures for a crystal with Mn3+.},
      cin          = {JCNS-FRM-II / JCNS-1 / MLZ},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000480499600036},
      doi          = {10.1021/acs.cgd.9b00298},
      url          = {https://juser.fz-juelich.de/record/863686},
}