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@ARTICLE{Dadda:171711,
      author       = {Dadda, Jayaram and Müller, Eckhard and Perlt, Susanne and
                      Höche, Thomas and Hermann, Raphael and Neubrand, Achim},
      title        = {{E}volution of phase segregation and eutectic structures in
                      {A}g{P}b$_{18}$ {S}b{T}e$_{20}$},
      journal      = {Physica status solidi / A},
      volume       = {211},
      number       = {6},
      issn         = {1862-6300},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2014-05280},
      pages        = {1276 - 1281},
      year         = {2014},
      abstract     = {The evolution of phase segregation in stoichiometric
                      quenched AgPbmSbTe2+m (m = 18,
                      Lead–Antimony–Silver–Tellurium – LAST-18) compounds
                      was studied starting from the known pseudo-binary diagrams
                      among Ag2Te, PbTe, Sb2Te3 and AgSbTe2. The compositions of
                      secondary phases indicate that liquid phase during cooling,
                      even under quenching conditions, follows mainly the liquidus
                      line on the 2PbTe–Ag0.45Sb0.55Te1.05 quasi-binary section
                      of the phase diagram until it reaches a critical point
                      $(18 mol.\%$ of 2PbTe) and then turns to Ag2Te- and
                      Sb2Te3-rich sides of quasi-ternary system. This has led to
                      the formation of various secondary phases at various stages
                      during the solidification, whose microstructural features
                      and morphology strongly depend upon their chemical
                      composition. Moreover, during solidification the local
                      compositional fluctuations of liquid phase in combination
                      with the shift of liquid composition towards Sb-rich side of
                      the phase diagram resulted in the development of eutectic
                      microstructures in some regions of LAST-18 matrix phase.
                      This suggests there exists a miscibility gap and eutectic
                      point below 600 °C on the 2PbTe–Ag0.45Sb0.55Te1.05
                      boundary line. These eutectic lamellar structures with a
                      cumulative composition close to LAST-3 are on the
                      200–500 nm length scales and possess thermal
                      conductivity of 0.55–0.65 W/m K at room temperature.
                      The low thermal conductivity of lamellar eutectic structures
                      was later confirmed on bulk samples using laser flash
                      analysis, where the samples were synthesized by quenching
                      and annealing. The results clearly demonstrate that one can
                      engineer the microstructures in LAST compounds by selecting
                      the appropriate initial composition from quasi
                      PbTe–Ag2Te–Sb2Te3 ternary phase diagram to lower the
                      thermal conductivity further.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {422 - Spin-based and quantum information (POF2-422) / 424 -
                      Exploratory materials and phenomena (POF2-424) / 542 -
                      Neutrons (POF2-542) / 544 - In-house Research with PNI
                      (POF2-544) / 54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-422 / G:(DE-HGF)POF2-424 /
                      G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544 /
                      G:(DE-HGF)POF2-54G24},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000337759000009},
      doi          = {10.1002/pssa.201300199},
      url          = {https://juser.fz-juelich.de/record/171711},
}