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Structural basis for the fast phase change of : Ring statistics analogy between the crystal and amorphous states
2.N. Yamada, M. Takenaga, and M. Takao, Proc. SPIE 695, 79 (1986).
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9.The density gain during crystallization of the amorphous phase exhibits 5% (Refs. 7 and 10) in and 14% (Refs. 8 and 11) in GeTe.
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13.E. Nishibori, M. Takata, K. Kato, M. Sakata, Y. Kubota, S. Aoyagi, Y. Kuroiwa, M. Yamakata, and N. Ikeda, Nucl. Instrum. Methods Phys. Res. A 467–468, 1045 (2001).
14.S. Kohara, K. Suzuya, Y. Kashihara, N. Matsumoto, N. Umesaki, and I. Sakai, Nucl. Instrum. Methods Phys. Res. A 467–468, 1030 (2001).
15.We employed the cubic NaCl-type structure as the approximate initial configuration of our RMC simulation for amorphous GeTe due to the limitation of our RMC program. It is thought that this approximation is not unreasonable, because it is well known that rhombohedral GeTe exhibits slightly distorted NaCl structure.
16.We derived the isotropic temperature factors of the crystal of GeTe and from Rietveld analysis. Magnitude of of Ge and Te sites in GeTe is smaller than and Te sites in , respectively. We suspect that this behavior is due to the large amount of the vacancies in .
18.Maeda and Wakagi found the formation of Ge–Ge homopolar bonds at around in , which disappear during amorphous-crystal phase change (Ref. 19).
19.Y. Maeda and M. Wakagi, Jpn. J. Appl. Phys., Part 1 30, 101 (1991).
21.The ring size distributions were calculated using the shortest-path analysis, where we count the number of atoms that exist in the count from an atom in the starting point and returning to the atom through the shortest path length in order to avoid the counting of a large-number fold ring that can be divided into smaller-number fold rings.
22.Ring statistics in is the result of the RMC simulation under the conditions that homopolar bonds (Ge–Ge and Sb–Sb) are not formed in , since the presence of the homopolar bonds have been denied (Ref. 4) and have not been confirmed from our experimental data of [Figs. S1 and S3 in EPAPS (Ref. 17)].
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