Thermal annealing studies of GeTe-Sb2Te3 alloys with multiple interfaces | Zendy

Valeria Bragaglia | Zendy; Antonio M. Mio | Zendy; Raffaella Calarco | Zendy

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Thermal annealing studies of GeTe-Sb2Te3 alloys with multiple interfaces

Author(s) -

Valeria Bragaglia,

Antonio M. Mio,

Raffaella Calarco

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5000338

Subject(s) - crystallization , annealing (glass) , materials science , amorphous solid , crystallography , vacancy defect , trigonal crystal system , chemical engineering , condensed matter physics , crystal structure , metallurgy , chemistry , physics , engineering

A high degree of vacancy ordering is obtained by annealing amorphous GeTe-Sb2Te3 (GST) alloys deposited on a crystalline substrate, which acts as a template for the crystallization. Under annealing the material evolves from amorphous to disordered rocksalt, to ordered rocksalt with vacancies arranged into (111) oriented layers, and finally converts into the stable trigonal phase. The role of the interface in respect to the formation of an ordered crystalline phase is studied by comparing the transformation stages of crystalline GST with and without a capping layer. The capping layer offers another crystallization interface, which harms the overall crystalline quality

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