A body-centered-cubic polymorph of the Ge2Sb2Te5 phase change alloy

被引：18

作者：

Cheng, Y. Q. ^{[1
]}

Xu, M. ^{[1
]}

Sheng, H. W. ^{[2
]}

Meng, Y. ^{[3
]}

Han, X. D. ^{[4
]}

Ma, E. ^{[1
]}

机构：

[1] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

[2] George Mason Univ, Dept Computat & Data Sci, Fairfax, VA 22030 USA

[3] Carnegie Inst Washington, High Pressure Collaborat Access Team, Argonne, IL 60439 USA

[4] Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Beijing 100124, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 13期

关键词：

HIGH-PRESSURE; TRANSITIONS; GERMANIUM; FORM;

D O I：

10.1063/1.3240885

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In Ge2Sb2Te5 (GST), the prototype phase-change alloy for data storage, in situ x-ray diffraction experiments reveal a pressure-induced crystalline-amorphous-crystalline transition sequence, all at the same fixed composition and in one experimental cycle. A body-centered-cubic polymorph is discovered at high pressures; the formation of this phase is attributable to its high packing density rendered possible by the switch from covalent to metallic bonding as predicted by ab initio calculations. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3240885]

引用

页数：3

共 27 条

[1] Structural phase transitions on the nanoscale:: The crucial pattern in the phase-change materials Ge2Sb2Te5 and GeTe [J].

Akola, J. ;

Jones, R. O. .

PHYSICAL REVIEW B, 2007, 76 (23)

[2] NEW PHASE-TRANSITION INTO THE BCC STRUCTURE IN ANTIMONY AT HIGH-PRESSURE [J].

AOKI, K ;

FUJIWARA, S ;

KUSAKABE, M .

SOLID STATE COMMUNICATIONS, 1983, 45 (02) :161-163

[3] HIGH-PRESSURE TRANSITIONS OF GERMANIUM AND A NEW HIGH-PRESSURE FORM OF GERMANIUM [J].

BATES, CH ;

DACHILLE, F ;

ROY, R .

SCIENCE, 1965, 147 (3660) :860-&

[4] PROJECTOR AUGMENTED-WAVE METHOD [J].

BLOCHL, PE .

PHYSICAL REVIEW B, 1994, 50 (24) :17953-17979

[5] A NEW DENSE FORM OF SOLID GERMANIUM [J].

BUNDY, FP ;

KASPER, JS .

SCIENCE, 1963, 139 (355) :340-&

[6] Unravelling the Mechanism of Pressure Induced Amorphization of Phase Change Materials [J].

Caravati, S. ;

Bernasconi, M. ;

Kuehne, T. D. ;

Krack, M. ;

Parrinello, M. .

PHYSICAL REVIEW LETTERS, 2009, 102 (20)

[7] Microscopic origin of the fast crystallization ability of Ge-Sb-Te phase-change memory materials [J].

Hegedus, J. ;

Elliott, S. R. .

NATURE MATERIALS, 2008, 7 (05) :399-405

[8] Changes in electronic structure and chemical bonding upon crystallization of the phase change material GeSb2Te4 [J].

Klein, A. ;

Dieker, H. ;

Spaeth, B. ;

Fons, P. ;

Kolobov, A. ;

Steimer, C. ;

Wuttig, M. .

PHYSICAL REVIEW LETTERS, 2008, 100 (01)

[9] Pressure-induced site-selective disordering of Ge2Sb2Te5:: A new insight into phase-change optical recording [J].

Kolobov, A. V. ;

Haines, J. ;

Pradel, A. ;

Ribes, M. ;

Fons, P. ;

Tominaga, J. ;

Katayama, Y. ;

Hammouda, T. ;

Uruga, T. .

PHYSICAL REVIEW LETTERS, 2006, 97 (03)

[10] Pressure-induced amorphization of quasibinary GeTe-Sb2Te3:: The role of vacancies [J].

Kolobov, A. V. ;

Haines, J. ;

Pradel, A. ;

Ribes, M. ;

Fons, P. ;

Tominaga, J. ;

Steimer, C. ;

Aquilanti, G. ;

Pascarelli, S. .

APPLIED PHYSICS LETTERS, 2007, 91 (02)

← 1 2 3 →