Two-stage crystallization process in Ge2Sb2Te5 alloys

E. Morales-Sánchez, M. A. Hernández-Landaverde, E. Prokhorov, G. Trapaga, J. González-Hernández

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The aim of this work is to investigate the amorphous-to-crystalline phase transformation process in Ge2Sb2Te5 ternary alloys. The experiments were carried out using impedance and X-ray diffraction measurements. The results have shown that the crystallization process in an amorphous Ge2Sb2Te5 alloy starts from nuclei, which appear below Tc and which were identified as the crystalline Ge 1Sb4Te7. As the temperature increases above Tc these nuclei were transformed into fcc-Ge2Sb2Te 5 crystals. In order to establish the mechanism of crystallization for this system, the Brugerman effective medium approximation was implemented to analyze nucleation and growth of the two stage involved (i.e., metastable Get Sb4Te7 and stable Ge2Sb2Te 5) through impedance measurements. The results of the simulations demonstrate a close agreement with experimental ones showing that phase transformation in Ge2Sb2Te5 is carried in two steps.

Original languageEnglish
Title of host publication2008 5th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2008
Pages475-477
Number of pages3
DOIs
StatePublished - 2008
Externally publishedYes
Event2008 5th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2008 - Mexico City, Mexico
Duration: 12 Nov 200814 Nov 2008

Publication series

Name2008 5th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2008

Conference

Conference2008 5th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2008
Country/TerritoryMexico
CityMexico City
Period12/11/0814/11/08

Keywords

  • Amorphous films
  • Crystallization process
  • Phase transformation

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