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Approaching the Glass Transition Temperature of GeTe by Crystallizing Ge 15 Te 85
Author(s) -
Pries Julian,
Yu Yuan,
Kerres Peter,
Häser Maria,
Steinberg Simon,
Gladisch Fabian,
Wei Shuai,
Lucas Pierre,
Wuttig Matthias
Publication year - 2021
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.202000478
Subject(s) - crystallization , glass transition , endotherm , amorphous solid , annealing (glass) , materials science , tellurium , transition temperature , crystallography , phase change memory , phase transition , thermodynamics , differential scanning calorimetry , condensed matter physics , chemistry , metallurgy , nanotechnology , composite material , polymer , physics , superconductivity , layer (electronics)
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 Ge 15 Te 85 . 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.