The elastic properties, generalized stacking fault energy and dissociated dislocations in MgB2 under different pressure

Handle URI:
http://hdl.handle.net/10754/562778
Title:
The elastic properties, generalized stacking fault energy and dissociated dislocations in MgB2 under different pressure
Authors:
Feng, Huifang; Wu, Xiaozhi; Gan, Liyong; Wang, Rui; Wei, Qunyi
Abstract:
The 〈112̄0〉 perfect dislocation in MgB2 is suggested to dissociate into two partial dislocations in an energy favorable way 〈112̄0〉 → 1/2 〈112̄0〉 + SF + 1/2 〈112̄0〉. This dissociation style is a correction of the previous dissociation 〈1000〉 → 1/3 〈11̄00〉 SF + 1/3 〈 2100〉proposed by Zhu et al. to model the partial dislocations and stacking fault observed by transmission electron microscopy. The latter dissociation results in a maximal stacking fault energy rather than a minimal one according to the generalized stacking fault energy calculated from first-principles methods. Furthermore, the elastic constants and anisotropy of MgB2 under different pressure are investigated. The core structures and mobilities of the 〈112̄0〉 dissociated dislocations are studied within the modified Peierls-Nabarro (P-N) dislocation theory. The variational method is used to solve the modified P-N dislocation equation and the Peierls stress is also determined under different pressure. High pressure effects on elastic anisotropy, core structure and Peierls stress are also presented. © 2013 Springer Science+Business Media New York.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Publisher:
Springer Verlag
Journal:
Journal of Superconductivity and Novel Magnetism
Issue Date:
31-May-2013
DOI:
10.1007/s10948-013-2226-0
Type:
Article
ISSN:
15571939
Sponsors:
Project Supported by the Natural Science Foundation of China (11104361) and Project No. CQDXWL2012015 supported by the Fundamental Research Funds for the Central Universities.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorFeng, Huifangen
dc.contributor.authorWu, Xiaozhien
dc.contributor.authorGan, Liyongen
dc.contributor.authorWang, Ruien
dc.contributor.authorWei, Qunyien
dc.date.accessioned2015-08-03T11:05:22Zen
dc.date.available2015-08-03T11:05:22Zen
dc.date.issued2013-05-31en
dc.identifier.issn15571939en
dc.identifier.doi10.1007/s10948-013-2226-0en
dc.identifier.urihttp://hdl.handle.net/10754/562778en
dc.description.abstractThe 〈112̄0〉 perfect dislocation in MgB2 is suggested to dissociate into two partial dislocations in an energy favorable way 〈112̄0〉 → 1/2 〈112̄0〉 + SF + 1/2 〈112̄0〉. This dissociation style is a correction of the previous dissociation 〈1000〉 → 1/3 〈11̄00〉 SF + 1/3 〈 2100〉proposed by Zhu et al. to model the partial dislocations and stacking fault observed by transmission electron microscopy. The latter dissociation results in a maximal stacking fault energy rather than a minimal one according to the generalized stacking fault energy calculated from first-principles methods. Furthermore, the elastic constants and anisotropy of MgB2 under different pressure are investigated. The core structures and mobilities of the 〈112̄0〉 dissociated dislocations are studied within the modified Peierls-Nabarro (P-N) dislocation theory. The variational method is used to solve the modified P-N dislocation equation and the Peierls stress is also determined under different pressure. High pressure effects on elastic anisotropy, core structure and Peierls stress are also presented. © 2013 Springer Science+Business Media New York.en
dc.description.sponsorshipProject Supported by the Natural Science Foundation of China (11104361) and Project No. CQDXWL2012015 supported by the Fundamental Research Funds for the Central Universities.en
dc.publisherSpringer Verlagen
dc.subjectDissociated dislocationsen
dc.subjectElastic propertiesen
dc.subjectMgB2en
dc.subjectPressure effecten
dc.titleThe elastic properties, generalized stacking fault energy and dissociated dislocations in MgB2 under different pressureen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Superconductivity and Novel Magnetismen
dc.contributor.institutionInstitute for Structure and Function, Chongqing University, 401331 Chongqing, Chinaen
dc.contributor.institutionCollege of Materials Science and Engineering, Chongqing University, 400044 Chongqing, Chinaen
kaust.authorGan, Liyongen
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