Glass transition of the phase change material AIST and its impact on crystallization

Julian Pries, Julia Charlotte Sehringer, Shuai Wei, Pierre Lucas, Matthias Wuttig

Research output: Contribution to journalArticlepeer-review

Abstract

Engineering phase change materials (PCM) to realize superior data storage devices requires a detailed understanding of crystallization kinetics and its temperature dependence. The temperature dependence of crystallization differs distinctly between crystallizing from the glassy phase and the undercooled liquid (UCL). Hence, knowing the phase from which crystallization occurs is necessary for predicting the switching ability. Here, we measure the glassy dynamics and crystallization kinetics using calorimetry for heating rates spanning over six orders of magnitude. Our results show that the prominent PCM (Ag,In)-doped Sb2Te (AIST) exhibits a change from crystallizing from the glassy phase to crystallizing from the UCL at a critical heating rate of 5000 K/s. Above the glass transition, the activation energy of crystallization changes drastically enabling rapid crystallization at elevated temperatures.

Original languageEnglish (US)
Article number105990
JournalMaterials Science in Semiconductor Processing
Volume134
DOIs
StatePublished - Nov 1 2021

Keywords

  • Crystallization kinetics
  • Glass transition temperature
  • Metavalent bonding
  • Phase change materials
  • Structural relaxation
  • Ultrafast differential scanning calorimetry (FDSC)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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