% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Heidenreich:278811,
      author       = {Heidenreich, M. and Kaps, Ch. and Simon, A. and
                      Schulze-Küppers, F. and Baumann, S.},
      title        = {{E}xpansion behaviour of ({G}d, {P}r)-substituted
                      {C}e{O}$_{2}$ in dependence on temperature and oxygen
                      partial pressure},
      journal      = {Solid state ionics},
      volume       = {283},
      issn         = {0167-2738},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2015-07038},
      pages        = {56-67},
      year         = {2015},
      abstract     = {Substituted ceria is a material which has attracted great
                      interest in solid oxide fuel cell technology [45]. Due to
                      its chemical stability, it may also be a promising candidate
                      as a mixed conductive membrane for oxygen separation with
                      flue gas contact. As part of this paper, dilatometry
                      measurements and X-ray powder diffraction experiments were
                      carried out on ceramic materials in air and in argon with
                      two separate series involving the substitution of ceria;
                      cerium was substituted with different amounts of Gd and Pr.
                      The first substitution of Gd caused an increase of the unit
                      cell with a small rise in linear thermal expansion in
                      relation to pure ceria. CeO2 − δ and Ce0.8Gd0.2O2 − δ
                      showed no chemical expansion in both atmospheres. The second
                      substitution of Gd with Pr decreased the unit cell in
                      relation to pure ceria. It is therefore understandable that
                      Pr is preferentially introduced and shown in this work as
                      Pr4 + in ceria. These samples showed a remarkable chemical
                      expansion in air and in argon. The chemical expansion
                      displayed a clear positive correlation with increasing Pr
                      content. The thermal expansion coefficients are comparable
                      to the first substitution without any trend in relation to
                      the amount of Pr. The dilatometry behaviour above 400 °C
                      can be explained due to the release of oxygen and
                      simultaneous reduction of Pr4 +, forming Pr3 + and oxygen
                      vacancies. The results are in accordance with the two
                      competing processes of forming vacancies (lattice
                      contraction) and ionic radius change (lattice expansion)
                      [16] and [27]. After cooling in air, the samples showed no
                      residual expansion. In contrast, these samples displayed a
                      remarkable residual expansion in argon of about $0.87\%$ of
                      the total relative expansion of $1.85\%$ for Ce0.8Pr0.2O2
                      − δ},
      cin          = {IEK-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000367113100008},
      doi          = {10.1016/j.ssi.2015.11.001},
      url          = {https://juser.fz-juelich.de/record/278811},
}