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@ARTICLE{Schwarzkopf:480620,
      author       = {Schwarzkopf, Jutta and Braun, Dorothee and Hanke, Michael
                      and Uecker, Reinhard and Schmidbauer, Martin},
      title        = {{S}train {E}ngineering of {F}erroelectric {D}omains in
                      ${K}x{N}a_{1−x}{N}b{O}_3$ {E}pitaxial {L}ayers},
      journal      = {Frontiers in Materials},
      volume       = {4},
      issn         = {2296-8016},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {PUBDB-2022-03901},
      pages        = {26},
      year         = {2017},
      abstract     = {The application of lattice strain through epitaxial growth
                      of oxide films on lattice mismatched perovskite-like
                      substrates strongly influences the structural properties of
                      ferroelectric domains and their corresponding piezoelectric
                      behavior. The formation of different ferroelectric phases
                      can be understood by a strain-phase diagram, which is
                      calculated within the framework of the
                      Landau–Ginzburg–Devonshire theory. In this paper, we
                      illustrate the opportunity of ferroelectric domain
                      engineering in the KxNa1−xNbO3 lead-free material system.
                      In particular, the following examples are discussed in
                      detail: (i) Different substrates (NdGaO3, SrTiO3, DyScO3,
                      TbScO3, and GdScO3) are used to systematically tune the
                      incorporated epitaxial strain from compressive to tensile.
                      This can be exploited to adjust the NaNbO3 thin film surface
                      orientation and, concomitantly, the vector of electrical
                      polarization, which rotates from mainly vertical to
                      exclusive in-plane orientation. (ii) In ferroelectric
                      NaNbO3, thin films grown on rare-earth scandate substrates,
                      highly regular stripe domain patterns are observed. By using
                      different film thicknesses, these can be tailored with
                      regard to domain periodicity and vertical polarization
                      component. (iii) A featured potassium concentration of x =
                      0.9 of KxNa1−xNbO3 thin films grown on (110) NdScO3
                      substrates favors the coexistence of two equivalent,
                      monoclinic, but differently oriented ferroelectric phases. A
                      complicated herringbone domain pattern is experimentally
                      observed which consists of alternating MC and a1a2 domains.
                      The coexistence of different types of ferroelectric domains
                      leads to polarization discontinuities at the domain walls,
                      potentially enabling high piezoelectric responses. In each
                      of these examples, the experimental results are in excellent
                      agreement with predictions based on the linear elasticity
                      theory.},
      cin          = {DOOR ; HAS-User},
      ddc          = {620},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {899 - ohne Topic (POF4-899)},
      pid          = {G:(DE-HGF)POF4-899},
      experiment   = {EXP:(DE-H253)D-BW2-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000418962500001},
      doi          = {10.3389/fmats.2017.00026},
      url          = {https://bib-pubdb1.desy.de/record/480620},
}