DOI: 10.1038/s42004-019-0114-7. Direct atomic identification of cation migration induced gradual cubic-to-hexagonal phase transition in Ge2Sb2Te5

Direct atomic identification of cation migration induced gradual cubic-to-hexagonal phase transition in Ge2Sb2Te5

10.1038/s42004-019-0114-7

Crossref journal-article

Springer Science and Business Media LLC

Communications Chemistry (297)

Abstract

AbstractGeTe-Sb2Te3 pseudobinary system, especially Ge2Sb2Te5 alloy, is the most desirable material to be commercialized in phase change random access memory. Directly resolving the local atomic arrangement of Ge2Sb2Te5 during intermediate steps is an effective method to understand its transition mechanism from face-centered-cubic to hexagonal phases. In this study, we provide insights into the atomic arrangement variation during face-centered-cubic to hexagonal transition process in Ge2Sb2Te5 alloy by using advanced atomic resolution energy dispersive X-ray spectroscopy. Induced by thermal annealing, randomly distributed germanium and antimony atoms would migrate to the specific (111) layer in different behaviors, and antimony atoms migrate earlier than germanium atoms during the phase transition process, gradually forming intermediate structures similar to hexagonal lattice. With the migration completed, the obtained stable hexagonal structure has a partially ordered stacking sequence described as below: -Te-Sbx/Gey-Te-Gex/Sby-Te-Gex/Sby-Te-Sbx/Gey-Te- (x > y), which is directly related to the migration process. The current visual fragments suggest a gradual transition mechanism, and guide the performance optimization of Ge2Sb2Te5 alloy.

Bibliography

Zheng, Y., Wang, Y., Xin, T., Cheng, Y., Huang, R., Liu, P., Luo, M., Zhang, Z., Lv, S., Song, Z., & Feng, S. (2019). Direct atomic identification of cation migration induced gradual cubic-to-hexagonal phase transition in Ge2Sb2Te5. Communications Chemistry, 2(1).

Authors 11

Yonghui Zheng (first)
Yong Wang (additional)
Tianjiao Xin (additional)
Yan Cheng (additional)
Rong Huang (additional)
Pan Liu (additional)
Min Luo (additional)
Zaoli Zhang (additional)
Shilong Lv (additional)
Zhitang Song (additional)
Songlin Feng (additional)

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Dates

Type	When
Created	6 years, 6 months ago (Feb. 1, 2019, 6:06 a.m.)
Deposited	2 years, 8 months ago (Dec. 17, 2022, 2:06 p.m.)
Indexed	1 month, 1 week ago (July 11, 2025, 6:35 a.m.)
Issued	6 years, 6 months ago (Feb. 1, 2019)
Published	6 years, 6 months ago (Feb. 1, 2019)
Published Online	6 years, 6 months ago (Feb. 1, 2019)

Funders 0

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BibTeX

@article{Zheng_2019, title={Direct atomic identification of cation migration induced gradual cubic-to-hexagonal phase transition in Ge2Sb2Te5}, volume={2}, ISSN={2399-3669}, url={http://dx.doi.org/10.1038/s42004-019-0114-7}, DOI={10.1038/s42004-019-0114-7}, number={1}, journal={Communications Chemistry}, publisher={Springer Science and Business Media LLC}, author={Zheng, Yonghui and Wang, Yong and Xin, Tianjiao and Cheng, Yan and Huang, Rong and Liu, Pan and Luo, Min and Zhang, Zaoli and Lv, Shilong and Song, Zhitang and Feng, Songlin}, year={2019}, month=feb }

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  "abstract": "<jats:title>Abstract</jats:title><jats:p>GeTe-Sb<jats:sub>2</jats:sub>Te<jats:sub>3</jats:sub> pseudobinary system, especially Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Te<jats:sub>5</jats:sub> alloy, is the most desirable material to be commercialized in phase change random access memory. Directly resolving the local atomic arrangement of Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Te<jats:sub>5</jats:sub> during intermediate steps is an effective method to understand its transition mechanism from face-centered-cubic to hexagonal phases. In this study, we provide insights into the atomic arrangement variation during face-centered-cubic to hexagonal transition process in Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Te<jats:sub>5</jats:sub> alloy by using advanced atomic resolution energy dispersive X-ray spectroscopy. Induced by thermal annealing, randomly distributed germanium and antimony atoms would migrate to the specific (111) layer in different behaviors, and antimony atoms migrate earlier than germanium atoms during the phase transition process, gradually forming intermediate structures similar to hexagonal\u00a0lattice. With the migration completed, the obtained stable hexagonal\u00a0structure has a partially ordered stacking sequence described as below: -Te-Sb<jats:sub>x</jats:sub>/Ge<jats:sub>y</jats:sub>-Te-Ge<jats:sub>x</jats:sub>/Sb<jats:sub>y</jats:sub>-Te-Ge<jats:sub>x</jats:sub>/Sb<jats:sub>y</jats:sub>-Te-Sb<jats:sub>x</jats:sub>/Ge<jats:sub>y</jats:sub>-Te- (x\u2009&gt;\u2009y), which is directly related to the migration process. The current visual fragments suggest a gradual transition mechanism, and guide the performance optimization of Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Te<jats:sub>5</jats:sub> alloy.</jats:p>",
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  "published": {
    "date-parts": [
      [
        2019,
        2,
        1
      ]
    ]
  },
  "assertion": [
    {
      "value": "24 August 2018",
      "order": 1,
      "name": "received",
      "label": "Received",
      "group": {
        "name": "ArticleHistory",
        "label": "Article History"
      }
    },
    {
      "value": "7 January 2019",
      "order": 2,
      "name": "accepted",
      "label": "Accepted",
      "group": {
        "name": "ArticleHistory",
        "label": "Article History"
      }
    },
    {
      "value": "1 February 2019",
      "order": 3,
      "name": "first_online",
      "label": "First Online",
      "group": {
        "name": "ArticleHistory",
        "label": "Article History"
      }
    },
    {
      "value": "The authors declare no competing interests.",
      "order": 1,
      "name": "Ethics",
      "group": {
        "name": "EthicsHeading",
        "label": "Competing interests"
      }
    }
  ],
  "article-number": "13"
}