Mechanism of shear transformation in Ge-Bi-Te alloys

Title
Mechanism of shear transformation in Ge-Bi-Te alloys
Authors
선창우이정용김용태
Keywords
GeBiTe; Phase change memory
Issue Date
2009-10
Publisher
physica status solidi (RRL) - Rapid Research Letters
Citation
VOL 3, NO 7-8, 254-256
Abstract
Since the rhombohedral unit cell in the NaCl lattice is caused by distortion along the <111> NaCl direction, the same phenomenon is expected during phase transition of Ge-Bi-Te (GBT). With this assumption, we performed transmission electron microscopy (TEM) studies on the phase transition in GBT alloys annealed at temperatures between the two crystallization temperatures. Atomic-scale TEM images show the formation of a GBT intermediate structure during the phase transition. Using the obtained results, we developed a new phase transition model in which the Ge/Bi layers are ordered in the <111> direction; further, continuous shearing and dilation occur in the {111} plane in <110> direction.
URI
http://pubs.kist.re.kr/handle/201004/36474
ISSN
18626254
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KIST Publication > Article
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