Kim, Eun Tae Lee, Jeong Yong Kim, Yong Tae 2024-01-21T00:32:13Z 2024-01-21T00:32:13Z 2021-09-02 2007-09-03 0003-6951 https://pubs.kist.re.kr/handle/201004/134112 Structural transformation of the Ge2Sb2Te5 was investigated by a high resolution transmission electron microscopy (HRTEM). It was found that Ge atoms undergo umbrella-flip motion from a tetrahedral site into an octahedral site in transforming from the amorphous to the metastable phase of Ge2Sb2Te5. The presence of a twin boundary between fcc and hexagonal structured Ge2Sb2Te5 was also confirmed through the HRTEM observations. These results support the umbrella-flip model proposed by Kolobov [Nat. Mater. 3, 703 (2004)] and the epitaxial growth model proposed by Park [Appl. Surf. Sci. 256, 8102 (2006)]. (c) 2007 American Institute of Physics. English AMER INST PHYSICS CRYSTAL-STRUCTURE Investigation of the structural transformation behavior of Ge2Sb2Te5 thin films using high resolution electron microscopy Article 10.1063/1.2783478 1 APPLIED PHYSICS LETTERS, v.91, no.10 APPLIED PHYSICS LETTERS 91 10 scie scopus 000249322900020 2-s2.0-34548486434 Physics, Applied Physics Article CRYSTAL-STRUCTURE