Electronic structure and bonding of hydrogen in a screw dislocated bcc Fe
The bonding of H-Fe is analyzed using qualitative electronic calculations in the framework of the atom superposition and electron delocalization orbital cluster method (ASED-MO). The changes in the electronic structure of bcc Fe upon introduction, a screw dislocation are compared with Fe surfaces. A...
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todo:paper_01694332_v172_n1-2_p8_Juan2023-10-03T15:07:06Z Electronic structure and bonding of hydrogen in a screw dislocated bcc Fe Juan, A. Irigoyen, B. Gesari, S. Adsorption Bonding Computer simulation Dislocations (crystals) Electronic structure Hydrogen Interfaces (materials) Mathematical models Single crystals Atom superposition Electron delocalization orbital cluster method Low index single crystal surfaces Steel The bonding of H-Fe is analyzed using qualitative electronic calculations in the framework of the atom superposition and electron delocalization orbital cluster method (ASED-MO). The changes in the electronic structure of bcc Fe upon introduction, a screw dislocation are compared with Fe surfaces. A comparison is drawn with H adsorption at Fe (1̄12) surface and H absorption in the bulk Fe with a dislocation. The results suggest that the detrimental effect of H on the Fe-Fe bonds in a screw dislocation is almost half-severe than in other defects, such as an edge dislocation or vacancy and it is limited to its first neighbor. An analysis of the orbital interaction reveals that Fe-H bonding involves mainly the Fe 4s and H 1s orbitals. When H is in the bulk, the region near screw dislocation core is much more repulsive than in a normal Fe lattice. These results allow us consider that H accumulation could be less favorable near a screw dislocation than an edge dislocation. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01694332_v172_n1-2_p8_Juan |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Adsorption Bonding Computer simulation Dislocations (crystals) Electronic structure Hydrogen Interfaces (materials) Mathematical models Single crystals Atom superposition Electron delocalization orbital cluster method Low index single crystal surfaces Steel |
spellingShingle |
Adsorption Bonding Computer simulation Dislocations (crystals) Electronic structure Hydrogen Interfaces (materials) Mathematical models Single crystals Atom superposition Electron delocalization orbital cluster method Low index single crystal surfaces Steel Juan, A. Irigoyen, B. Gesari, S. Electronic structure and bonding of hydrogen in a screw dislocated bcc Fe |
topic_facet |
Adsorption Bonding Computer simulation Dislocations (crystals) Electronic structure Hydrogen Interfaces (materials) Mathematical models Single crystals Atom superposition Electron delocalization orbital cluster method Low index single crystal surfaces Steel |
description |
The bonding of H-Fe is analyzed using qualitative electronic calculations in the framework of the atom superposition and electron delocalization orbital cluster method (ASED-MO). The changes in the electronic structure of bcc Fe upon introduction, a screw dislocation are compared with Fe surfaces. A comparison is drawn with H adsorption at Fe (1̄12) surface and H absorption in the bulk Fe with a dislocation. The results suggest that the detrimental effect of H on the Fe-Fe bonds in a screw dislocation is almost half-severe than in other defects, such as an edge dislocation or vacancy and it is limited to its first neighbor. An analysis of the orbital interaction reveals that Fe-H bonding involves mainly the Fe 4s and H 1s orbitals. When H is in the bulk, the region near screw dislocation core is much more repulsive than in a normal Fe lattice. These results allow us consider that H accumulation could be less favorable near a screw dislocation than an edge dislocation. |
format |
JOUR |
author |
Juan, A. Irigoyen, B. Gesari, S. |
author_facet |
Juan, A. Irigoyen, B. Gesari, S. |
author_sort |
Juan, A. |
title |
Electronic structure and bonding of hydrogen in a screw dislocated bcc Fe |
title_short |
Electronic structure and bonding of hydrogen in a screw dislocated bcc Fe |
title_full |
Electronic structure and bonding of hydrogen in a screw dislocated bcc Fe |
title_fullStr |
Electronic structure and bonding of hydrogen in a screw dislocated bcc Fe |
title_full_unstemmed |
Electronic structure and bonding of hydrogen in a screw dislocated bcc Fe |
title_sort |
electronic structure and bonding of hydrogen in a screw dislocated bcc fe |
url |
http://hdl.handle.net/20.500.12110/paper_01694332_v172_n1-2_p8_Juan |
work_keys_str_mv |
AT juana electronicstructureandbondingofhydrogeninascrewdislocatedbccfe AT irigoyenb electronicstructureandbondingofhydrogeninascrewdislocatedbccfe AT gesaris electronicstructureandbondingofhydrogeninascrewdislocatedbccfe |
_version_ |
1782029936992714752 |