Approaching the Glass Transition Temperature of GeTe by Crystallizing Ge15Te85

Julian Pries, Yuan Yu, Peter Kerres, Maria Häser, Simon Steinberg, Fabian Gladisch, Shuai Wei, Pierre Lucas, Matthias Wuttig

Research output: Contribution to journalArticlepeer-review

Abstract

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 Tg. Herein, a new approach is realized to estimate the glass transition temperature Tg for GeTe through progressive crystallization of Ge15Te85. Selective crystallization of pure tellurium during sub-Tg 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 Tg of GeTe.

Original languageEnglish (US)
Article number2000478
JournalPhysica Status Solidi - Rapid Research Letters
Volume15
Issue number3
DOIs
StatePublished - Mar 2021

Keywords

  • crystallization kinetics
  • glass transition
  • metavalent bonding
  • phase-change materials
  • undercooled liquids

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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