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Approaching the Glass Transition Temperature of GeTe by Crystallizing Ge15Te85

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  • Julian Pries, Institute of Physics (IA), RWTH Aachen University
  • ,
  • Yuan Yu, Institute of Physics (IA), RWTH Aachen University
  • ,
  • Peter Kerres, Institute of Physics (IA), RWTH Aachen University
  • ,
  • Maria Haeser, Institute of Physics (IA), RWTH Aachen University
  • ,
  • Simon Steinberg, RWTH Aachen University
  • ,
  • Fabian Gladisch, RWTH Aachen University
  • ,
  • Shuai Wei
  • Pierre Lucas, Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona
  • ,
  • Matthias Wuttig, Institute of Physics (IA), RWTH Aachen University

Like many phase-change materials, GeTe crystallizes upon heating at a conventional rate before the calorimetric glass transition is reached. This has so far prevented an unambiguous determination of its glass transition temperature T-g. Herein, a new approach is realized to estimate the glass transition temperature T-g for GeTe through progressive crystallization of Ge15Te85. Selective crystallization of pure tellurium during sub-T-g annealing leads to a gradual change in the composition of the amorphous surrounding toward that of GeTe. This gives rise to a new endotherm whose onset temperature gradually approaches the T-g of GeTe.

TidsskriftPhysica Status Solidi. Rapid Research Letters
Antal sider6
StatusUdgivet - mar. 2021

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