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- Title
Truncated Lorch-window method revealing the off-octahedral Ge in nanocrystalline Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub>.
- Authors
Liu, X. Q.; Li, X. B.; Zhang, B.; Zhang, S. B.; Ma, E.; Zhang, Z.; Han, X. D.
- Abstract
Traditional Lorch-window technique was modified to the truncated Lorch-window through various truncation ranges to apply the Lorch-window functions. The terminal ripples in radial distribution functions (RDFs) were weakened and the shoulder peak at 2.6 Å in crystalline Ge2Sb2Te5 (GST) was revealed by the indication of the off-octahedral Ge. The Cs-corrected high resolution transmission electron microscopy image and the corresponding simulations suggest that the off-octahedral Ge atoms are indeed in the tetrahedral symmetry. These results indicate that the complex structural details in the intermediate phase of GST other than simple rock-salt structure though the quantified information, such as the accurate atomic positions of the off-octahedral Ge need being further clarified in the future. These results also reveal the significance of high-Q signals in revealing the structures in short range order. Left (a): Original reduced interference function F( Q) (black) and truncated F( Q) data. Right (b): Corresponding RDF curves. L-12 (red half-solid triangle) represent the data with a truncation range of 12 Å−1, and L-16 (open square) for the truncation range of 16 Å−1.
- Publication
Physica Status Solidi (B), 2012, Vol 249, Issue 10, p1914
- ISSN
0370-1972
- Publication type
Article
- DOI
10.1002/pssb.201200377