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@ARTICLE{Vrtnik:826018,
      author       = {Vrtnik, S. and Koželj, P. and Meden, A. and Maiti, S. and
                      Steurer, W. and Feuerbacher, M. and Dolinšek, J.},
      title        = {{S}uperconductivity in thermally annealed
                      {T}a-{N}b-{H}f-{Z}r-{T}i high-entropy alloys},
      journal      = {Journal of alloys and compounds},
      volume       = {695},
      issn         = {0925-8388},
      address      = {Lausanne},
      publisher    = {Elsevier},
      reportid     = {FZJ-2017-00287},
      pages        = {3530 - 3540},
      year         = {2017},
      abstract     = {We present a study of superconductivity in Ta-Nb-Hf-Zr-Ti
                      high-entropy alloys (HEAs) by investigating four samples of
                      different atomic concentrations (equimolar and
                      off-equimolar) and number of components (4 and 5), subjected
                      to different thermal treatments. The structure of the
                      samples varied between a homogeneous random solid solution
                      and a partially ordered nanostructure in the form of a
                      three-dimensional grid of short-range ordered atomic
                      clusters enriched in Zr and Hf that has developed during
                      long-time annealing. Superconductivity was found to be a
                      robust phenomenon, being quite insensitive to the actual
                      structure of the material. All investigated samples were
                      superconducting in the entirety of their volumes. The
                      superconducting transition temperatures TC of the samples
                      are scattered in the range between 5.0 and 7.3 K and this
                      scatter could be related to the degree of structural and
                      chemical inhomogeneity of the samples. In the samples with
                      partially ordered nanostructure, short-range atomic clusters
                      possess a slightly different TC than the Ta- and Nb-rich
                      matrix. Our results also demonstrate the important fact that
                      the formation, stability and structure of a regular
                      (non-ideal) HEA mixture are determined by both, the
                      minimization of the mixing enthalpy that favors local atomic
                      ordering and the maximization of the mixing entropy that
                      favors a random solid solution. The actual equilibrium state
                      achieved during long-time thermal annealing via the atomic
                      diffusion is generally partially ordered, and the resulting
                      nanostructure is a sensitive function of the number of
                      components constituting the HEA, their concentrations, the
                      differences in the atomic radii and the annealing
                      temperature and time. This nanostructure essentially
                      determines the electronic properties of HEA materials.},
      cin          = {PGI-5},
      ddc          = {670},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000391818100074},
      doi          = {10.1016/j.jallcom.2016.11.417},
      url          = {https://juser.fz-juelich.de/record/826018},
}