Short- and intermediate-range order in amorphous GeTe

被引：19

作者：

Stellhorn, Jens R. ^{[1
]}

Hosokawa, Shinya ^{[1
,2
]}

Pilgrim, Wolf-Christian ^{[1
]}

Blanc, Nils ^{[3
,4
]}

Boudet, Nathalie ^{[3
,4
]}

Tajiri, Hiroo ^{[5
]}

Kohara, Shinji ^{[5
,6
]}

机构：

[1] Univ Marburg, Dept Chem, D-35032 Marburg, Germany

[2] Kumamoto Univ, Dept Phys, Grad Sch Sci & Technol, Kumamoto 8608555, Japan

[3] Univ Grenoble Alpes, Inst Neel, F-38000 Grenoble, France

[4] CNRS, Inst Neel, F-38000 Grenoble, France

[5] JASRI SPring 8, Sayo, Hyogo 6795198, Japan

[6] Natl Inst Mat Sci, Sayo, Hyogo 6795148, Japan

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2016年 / 253卷 / 06期

关键词：

amorphous materials; anomalous scattering; GeTe; intermediate-range order; phase-change materials; X-RAY-SCATTERING; FAST CRYSTALLIZATION; DIFFRACTION; BEAMLINE; ABILITY;

D O I：

10.1002/pssb.201552559

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have investigated amorphous GeTe by anomalous X-ray scattering coupled with reverse Monte Carlo modeling. Experiments were conducted at the two K-absorption edges in order to determine differential structure factors for both elements. The results indicate that simple models like the 8 - N bonding rule cannot accurately rationalize the atomic structure. Te atoms are found to be over-coordinated with a mean coordination number of about 2.5. Moreover, evidence is given for a high level of intermediate-range order based on Ge, which has not been reported previously. This order has a pronounced effect on the ring statistics observed in the amorphous network, and thereby on the phase-change speed of GeTe. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：1038 / 1045

页数：8

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