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@PHDTHESIS{Huang:14775,
      author       = {Huang, Bingxin},
      title        = {{T}hermo-{M}echanical {P}roperties of {M}ixed
                      {I}on-{E}lectron {C}onducting {M}embrane {M}aterials},
      volume       = {124},
      issn         = {1866-1793},
      school       = {RWTH Aachen},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-14775},
      isbn         = {978-3-89336-746-7},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {130 S.},
      year         = {2010},
      note         = {Record converted from VDB: 12.11.2012; RWTH Aachen, Diss.,
                      2010},
      abstract     = {The thesis presents thermo-mechanical properties of
                      La$_{0.58}$Sr$_{0.4}$Co$_{0.2}$Fe$_{0.8}$O$_{3-\delta}$
                      (LSCF) and
                      Ba$_{0.5}$Sr$_{0.5}$Co$_{0.8}$Fe$_{0.2}$O$_{3-\delta}$
                      (BSCF) perovskite materials, which are considered as oxygen
                      transport membranes (OTM) for gas separation units.
                      Ring-on-ring bending test with disk-shaped samples and
                      depth-sensitive micro-indentation have been used as
                      macroscopic and microscopic tests, respectively. In
                      addition, the thermo-mechanical properties of a third OTM
                      candidate material La$_{2}$NiO$_{4+\delta}$(LNO) were
                      investigated. The results of the thermo-mechanical
                      measurements with the BSCF revealed an anomaly between 200
                      °C and 400 °C. In particular, the temperature dependence
                      of Young’s modulus shows a minimum at ~ 200 °C. Fracture
                      stress and toughness exhibit a qualitatively similar
                      behavior with a minimum between 200 °C and 400 °C, before
                      recovering between 500 °C and 800 °C. X-ray diffraction
                      analyses verified that BSCF remains cubic in the relevant
                      temperature range. Hence the anomalies were assumed to be
                      related to the transition of Co$^{3+}$ spin states reported
                      for other Co-containing perovskites. This assumption could
                      be experimentally confirmed by magnetic susceptibility
                      measurements. The fracture surfaces of the specimens are not
                      affected by the mechanical anomalies at intermediate
                      temperatures, since only a transgranular fracture mode has
                      been observed. Complementary to the mechanical
                      characterization of BSCF, also the temperature dependency of
                      fracture stress and elastic behavior of LSCF have been
                      determined. Phase compositions of LSCF have been studied by
                      in-situ high temperature XRD. Changes in phase composition
                      with temperature are observed. At ambient temperature the
                      LSCF perovskite material comprises two phases: rhombohedral
                      and cubic symmetry. The ratio of the two phases depends on
                      both cooling rate and atmosphere. The transition of
                      rhombohedral to cubic occurs between 700 °C and 800 °C in
                      air. The transition appears to be associated with a change
                      of heat capacity. The [...]},
      cin          = {IEK-2},
      cid          = {I:(DE-Juel1)IEK-2-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/14775},
}