Pressure-induced crystallization of amorphous Ge2 Sb2 Te5

M. Xu; Y. Meng; Y. Q. Cheng; H. W. Sheng; X. D. Han; E. Ma

doi:10.1063/1.3493110

Pressure-induced crystallization of amorphous Ge₂ Sb₂ Te₅

M. Xu, Y. Meng, Y. Q. Cheng, H. W. Sheng, X. D. Han, E. Ma

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Using in situ x-ray diffraction, we demonstrate a pressure-induced crystallization of as-deposited amorphous Ge₂ Sb₂ Te ₅ (a-GST) into a body-centered-cubic (bcc) solid solution at 28 GPa, and the back transformation from the bcc-GST to a-GST. A large hysteresis loop was observed, as the bcc-GST was retained until 15 GPa. Comparisons have been made, employing the x-ray data and the structural information obtained from ab initio molecular dynamics simulations, between the as-deposited a-GST and the a-GST obtained from the pressure-induced collapse of the rocksalt GST, both at a high hydrostatic pressure (20 GPa) prior to their crystallization to bcc. The results suggest that both routes have resulted in the same high-pressure amorphous state, which explains their crystallization into bcc-GST at similar pressures.

Original language	English
Article number	083519
Journal	Journal of Applied Physics
Volume	108
Issue number	8
DOIs	https://doi.org/10.1063/1.3493110
State	Published - Oct 15 2010
Externally published	Yes

Funding

This work is supported at JHU by U.S. DOE, BES-MS&E (Grant No. DE-FG02-09ER46056), by ONR Grant No. 09PR08570-00/1054998 (H.W.S.), and by the Chinese National Basic Research Program, Grant No. 2007CB935400 (X.D.H.). Experiments were conducted at Sector 16IDB, HPCAT (funded by DOE-BES, DOE-NNSA, NSF, and the W. M. Keck Foundation), APS (DOE-BES, Grant No. DE-AC02-06CH11357), Argonne National Laboratory.

Funders	Funder number
BES-MS&E	DE-FG02-09ER46056
DOE-BES
DOE-NNSA
National Science Foundation
Office of Naval Research	09PR08570-00/1054998
U.S. Department of Energy
W. M. Keck Foundation
Argonne National Laboratory
Johns Hopkins University
American Pain Society	DE-AC02-06CH11357
National Key Research and Development Program of China	2007CB935400

Access to Document

10.1063/1.3493110

Cite this

@article{17f6fe0741684aa6a717f0d13721a89e,

title = "Pressure-induced crystallization of amorphous Ge2 Sb2 Te5",

abstract = "Using in situ x-ray diffraction, we demonstrate a pressure-induced crystallization of as-deposited amorphous Ge2 Sb2 Te 5 (a-GST) into a body-centered-cubic (bcc) solid solution at 28 GPa, and the back transformation from the bcc-GST to a-GST. A large hysteresis loop was observed, as the bcc-GST was retained until 15 GPa. Comparisons have been made, employing the x-ray data and the structural information obtained from ab initio molecular dynamics simulations, between the as-deposited a-GST and the a-GST obtained from the pressure-induced collapse of the rocksalt GST, both at a high hydrostatic pressure (20 GPa) prior to their crystallization to bcc. The results suggest that both routes have resulted in the same high-pressure amorphous state, which explains their crystallization into bcc-GST at similar pressures.",

author = "M. Xu and Y. Meng and Cheng, {Y. Q.} and Sheng, {H. W.} and Han, {X. D.} and E. Ma",

year = "2010",

month = oct,

day = "15",

doi = "10.1063/1.3493110",

language = "English",

volume = "108",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

number = "8",

}

TY - JOUR

T1 - Pressure-induced crystallization of amorphous Ge2 Sb2 Te5

AU - Xu, M.

AU - Meng, Y.

AU - Cheng, Y. Q.

AU - Sheng, H. W.

AU - Han, X. D.

AU - Ma, E.

PY - 2010/10/15

Y1 - 2010/10/15

N2 - Using in situ x-ray diffraction, we demonstrate a pressure-induced crystallization of as-deposited amorphous Ge2 Sb2 Te 5 (a-GST) into a body-centered-cubic (bcc) solid solution at 28 GPa, and the back transformation from the bcc-GST to a-GST. A large hysteresis loop was observed, as the bcc-GST was retained until 15 GPa. Comparisons have been made, employing the x-ray data and the structural information obtained from ab initio molecular dynamics simulations, between the as-deposited a-GST and the a-GST obtained from the pressure-induced collapse of the rocksalt GST, both at a high hydrostatic pressure (20 GPa) prior to their crystallization to bcc. The results suggest that both routes have resulted in the same high-pressure amorphous state, which explains their crystallization into bcc-GST at similar pressures.

AB - Using in situ x-ray diffraction, we demonstrate a pressure-induced crystallization of as-deposited amorphous Ge2 Sb2 Te 5 (a-GST) into a body-centered-cubic (bcc) solid solution at 28 GPa, and the back transformation from the bcc-GST to a-GST. A large hysteresis loop was observed, as the bcc-GST was retained until 15 GPa. Comparisons have been made, employing the x-ray data and the structural information obtained from ab initio molecular dynamics simulations, between the as-deposited a-GST and the a-GST obtained from the pressure-induced collapse of the rocksalt GST, both at a high hydrostatic pressure (20 GPa) prior to their crystallization to bcc. The results suggest that both routes have resulted in the same high-pressure amorphous state, which explains their crystallization into bcc-GST at similar pressures.

UR - http://www.scopus.com/inward/record.url?scp=78149457502&partnerID=8YFLogxK

U2 - 10.1063/1.3493110

DO - 10.1063/1.3493110

M3 - Article

AN - SCOPUS:78149457502

SN - 0021-8979

VL - 108

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 8

M1 - 083519

ER -

Pressure-induced crystallization of amorphous Ge₂ Sb₂ Te₅

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this