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@ARTICLE{Jelen:903586,
      author       = {Jelen, Andreja and Jang, Jae Hyuck and Oh, Junhyup and Kim,
                      Hae Jin and Meden, Anton and Vrtnik, Stane and Feuerbacher,
                      Michael and Dolinšek, Janez},
      title        = {{N}anostructure and local polymorphism in “ideal-like”
                      rare-earths-based high-entropy alloys},
      journal      = {Materials characterization},
      volume       = {172},
      issn         = {1044-5803},
      address      = {New York, NY},
      publisher    = {Science Direct},
      reportid     = {FZJ-2021-05240},
      pages        = {110837 -},
      year         = {2021},
      abstract     = {Rare-earths-based hexagonal high-entropy alloys (HEAs)
                      composed of the elements from the heavy half of the
                      lanthanide series (from Gd to Lu, with the exception of Yb)
                      and yttrium are much closer to an ideal solid solution than
                      HEAs composed of other elements from the entire periodic
                      system. Using the method of high-frequency levitation
                      melting, three candidates for a physical realization of an
                      ideal HEA were synthesized, an Y-Gd-Tb-Dy-Ho, a
                      Gd-Tb-Dy-Ho-Lu and a Tb-Dy-Ho-Er-Tm, and a study of their
                      structure and composition was performed to see how close to
                      ideal HEA samples can be prepared. We found that all three
                      HEAs exhibit a nanostructure of a hexagonal close-packed
                      (hcp) matrix and rod-like cubic close-packed (ccp)
                      precipitates of the lengths 200–600 nm and widths 50–100
                      nm. EDS analysis has revealed a general trend that the
                      precipitates are slightly enriched in the elements with
                      larger atomic radii relative to the matrix. The origin of
                      the nanostructure that represents a local hcp ↔ ccp
                      polymorphism at zero external pressure appear to be lattice
                      distortions (equivalent to a chemical pressure), occurring
                      due to the minute differences of the elements' atomic radii.
                      The volume per atom is slightly larger in the ccp
                      precipitates that are enriched in larger atoms, so that the
                      lattice distortions can be better accommodated and
                      minimized, which reduces the lattice strain energy that
                      contributes to the mixing enthalpy ΔHmix ≠ 0. The
                      employed synthesis route, which is standard for the
                      preparation of alloys of high structural quality, did not
                      lead to a physical realization of an ideal HEA in the most
                      promising theoretical candidates.},
      cin          = {ER-C-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)ER-C-1-20170209},
      pnm          = {5353 - Understanding the Structural and Functional Behavior
                      of Solid State Systems (POF4-535)},
      pid          = {G:(DE-HGF)POF4-5353},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000620963600006},
      doi          = {10.1016/j.matchar.2020.110837},
      url          = {https://juser.fz-juelich.de/record/903586},
}