Local order in amorphous Ge2Sb2Te5 and GeSb2Te4

Jovari  P; Kaban  I; Steiner  JBeuneu  BSchops  AWebb  MA

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Local order in amorphous Ge2Sb2Te5 and GeSb2Te4

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The structure of amorphous Ge2Sb2Te5 and GeSb2Te4 phase-change alloys was investigated by high energy x-ray diffraction, extended x-ray-absorption fine structure, and neutron diffraction. The reverse Monte Carlo simulation technique was used to generate large scale atomic models compatible with all experimental data sets. Simulations revealed that Ge-Ge bonding is present already in GeSb2Te4. Ge-Sb bonding was also found to be significant for both compositions. Within experimental uncertainties, all atomic species satisfy formal valence requirements: Ge is fourfold coordinated, Sb has three neighbors, and Te is mostly twofold coordinated. The environment of Ge atoms was investigated in detail. The predominance of GeTe4 or Te3Ge-GeTe3 units in these compositions can be excluded. Instead, these alloys are characterized by a variety of local motifs.

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《Physical review, B. Condensed matter and materials physics》 |2008年第3期|035202-1-035202-6-0|共6页
作者
Jovari P; Kaban I; Steiner JBeuneu BSchops AWebb MA;
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作者单位

Hungarian Acad Sci, Res Inst Solid State Phys & Opt, H-1525 Budapest, Hungary;

Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany;

Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, GermanyCEA Saclay, Lab Leon Brillouin, F-91191 Gif Sur Yvette, FranceDESY, HASYLAB, D-22603 Hamburg, Germany;

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正文语种英语
中图分类固体物理学;
关键词
EXAFS DATA; CRYSTALLIZATION; GE15TE85; MEMORY; RMC++;

Local order in amorphous Ge2Sb2Te5 and GeSb2Te4

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