Octahedral to tetrahedral bonding transitions in the local structure of phase change optical media Ge2Sb2Se5xTe5−5x with Se doping
Random access memories utilize fast, reversible switching between ordered and disordered states of matter in phase change materials (PCMs) such as Ge2Sb2Te5−5x. The short-range structure in the disordered phase has been described either as (i) a network of Ge tetrahedra or (ii) Peierls distorted Ge/...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2023-04-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0133981 |
| _version_ | 1797771857216143360 |
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| author | Zhenyang Xu Francisco Restrepo Junjing Zhao Utpal Chatterjee Despina Louca |
| author_facet | Zhenyang Xu Francisco Restrepo Junjing Zhao Utpal Chatterjee Despina Louca |
| author_sort | Zhenyang Xu |
| collection | DOAJ |
| description | Random access memories utilize fast, reversible switching between ordered and disordered states of matter in phase change materials (PCMs) such as Ge2Sb2Te5−5x. The short-range structure in the disordered phase has been described either as (i) a network of Ge tetrahedra or (ii) Peierls distorted Ge/Sb octahedra. The PCM transition was investigated in bulk Ge2Sb2Se5xTe5−5x (GSST), in which amorphization sets in with Se doping (x ≈ 0.85) upon quenching. GSST has a hexagonal crystalline ground state with Ge/Sb octahedral coordination, but the phase change transition to the amorphous state that is only observed when the system is quenched brings a short-range structure with sharp, tetrahedrally coordinated Ge/Sb correlations and shortened bonds that are distinctly different from the expected octahedral pairing. |
| first_indexed | 2024-03-12T21:43:35Z |
| format | Article |
| id | doaj.art-b4d9fd1d26c54b179df220c870b30d34 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-03-12T21:43:35Z |
| publishDate | 2023-04-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-b4d9fd1d26c54b179df220c870b30d342023-07-26T14:57:20ZengAIP Publishing LLCAIP Advances2158-32262023-04-01134045005045005-610.1063/5.0133981Octahedral to tetrahedral bonding transitions in the local structure of phase change optical media Ge2Sb2Se5xTe5−5x with Se dopingZhenyang Xu0Francisco Restrepo1Junjing Zhao2Utpal Chatterjee3Despina Louca4Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USADepartment of Physics, University of Virginia, Charlottesville, Virginia 22904, USADepartment of Physics, University of Virginia, Charlottesville, Virginia 22904, USADepartment of Physics, University of Virginia, Charlottesville, Virginia 22904, USADepartment of Physics, University of Virginia, Charlottesville, Virginia 22904, USARandom access memories utilize fast, reversible switching between ordered and disordered states of matter in phase change materials (PCMs) such as Ge2Sb2Te5−5x. The short-range structure in the disordered phase has been described either as (i) a network of Ge tetrahedra or (ii) Peierls distorted Ge/Sb octahedra. The PCM transition was investigated in bulk Ge2Sb2Se5xTe5−5x (GSST), in which amorphization sets in with Se doping (x ≈ 0.85) upon quenching. GSST has a hexagonal crystalline ground state with Ge/Sb octahedral coordination, but the phase change transition to the amorphous state that is only observed when the system is quenched brings a short-range structure with sharp, tetrahedrally coordinated Ge/Sb correlations and shortened bonds that are distinctly different from the expected octahedral pairing.http://dx.doi.org/10.1063/5.0133981 |
| spellingShingle | Zhenyang Xu Francisco Restrepo Junjing Zhao Utpal Chatterjee Despina Louca Octahedral to tetrahedral bonding transitions in the local structure of phase change optical media Ge2Sb2Se5xTe5−5x with Se doping AIP Advances |
| title | Octahedral to tetrahedral bonding transitions in the local structure of phase change optical media Ge2Sb2Se5xTe5−5x with Se doping |
| title_full | Octahedral to tetrahedral bonding transitions in the local structure of phase change optical media Ge2Sb2Se5xTe5−5x with Se doping |
| title_fullStr | Octahedral to tetrahedral bonding transitions in the local structure of phase change optical media Ge2Sb2Se5xTe5−5x with Se doping |
| title_full_unstemmed | Octahedral to tetrahedral bonding transitions in the local structure of phase change optical media Ge2Sb2Se5xTe5−5x with Se doping |
| title_short | Octahedral to tetrahedral bonding transitions in the local structure of phase change optical media Ge2Sb2Se5xTe5−5x with Se doping |
| title_sort | octahedral to tetrahedral bonding transitions in the local structure of phase change optical media ge2sb2se5xte5 5x with se doping |
| url | http://dx.doi.org/10.1063/5.0133981 |
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