Evolution of crystal structures in GeTe during phase transition

Kwangsik Jeong, Seungjong Park, Dambi Park, Min Ahn, Jeonghwa Han, Wonjun Yang, Hong Sik Jeong, Mann-Ho Cho

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We investigated changes in the crystal structure of GeTe during its phase transition. Using density functional theory (DFT) calculations, four possible crystal structures were identified: R3m, P1, Cm, and Fm3m. Among these, P1 and Cm were examined here for the first time. By calculating the internal energy of the crystal volume change, we verified that P1, R3m, and Cm can coexist in crystalline GeTe. The X-ray diffraction spectra of annealed and laser-irradiated GeTe films revealed coexisting P1 or R3m and Cm. In addition, we confirmed that Cm transforms into P1 or R3m after laser irradiation. The presence of these new structures was revealed in the crystal Raman spectra. Many of the Raman peaks in the crystalized GeTe could be explained by the coexistence of various structures. By calculating the band gaps of these structures, we also found that a structural transformation induces a change in the crystal resistance, owing to differences in the band gaps of individual structures. The generation of new crystal structures suggests a facile phase change and instability during the structural transformation.

Original languageEnglish
Article number1154
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

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Crystal structure
Phase transitions
Crystals
Energy gap
Laser beam effects
Density functional theory
Raman scattering
Crystalline materials
X ray diffraction
Lasers

All Science Journal Classification (ASJC) codes

  • General

Cite this

Jeong, Kwangsik ; Park, Seungjong ; Park, Dambi ; Ahn, Min ; Han, Jeonghwa ; Yang, Wonjun ; Jeong, Hong Sik ; Cho, Mann-Ho. / Evolution of crystal structures in GeTe during phase transition. In: Scientific Reports. 2017 ; Vol. 7, No. 1.
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abstract = "We investigated changes in the crystal structure of GeTe during its phase transition. Using density functional theory (DFT) calculations, four possible crystal structures were identified: R3m, P1, Cm, and Fm3m. Among these, P1 and Cm were examined here for the first time. By calculating the internal energy of the crystal volume change, we verified that P1, R3m, and Cm can coexist in crystalline GeTe. The X-ray diffraction spectra of annealed and laser-irradiated GeTe films revealed coexisting P1 or R3m and Cm. In addition, we confirmed that Cm transforms into P1 or R3m after laser irradiation. The presence of these new structures was revealed in the crystal Raman spectra. Many of the Raman peaks in the crystalized GeTe could be explained by the coexistence of various structures. By calculating the band gaps of these structures, we also found that a structural transformation induces a change in the crystal resistance, owing to differences in the band gaps of individual structures. The generation of new crystal structures suggests a facile phase change and instability during the structural transformation.",
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Jeong, K, Park, S, Park, D, Ahn, M, Han, J, Yang, W, Jeong, HS & Cho, M-H 2017, 'Evolution of crystal structures in GeTe during phase transition', Scientific Reports, vol. 7, no. 1, 1154. https://doi.org/10.1038/s41598-017-01154-z

Evolution of crystal structures in GeTe during phase transition. / Jeong, Kwangsik; Park, Seungjong; Park, Dambi; Ahn, Min; Han, Jeonghwa; Yang, Wonjun; Jeong, Hong Sik; Cho, Mann-Ho.

In: Scientific Reports, Vol. 7, No. 1, 1154, 01.12.2017.

Research output: Contribution to journalArticle

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AU - Park, Dambi

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