Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Assessment of Strain-Generated Oxygen Vacancies Using SrTiO3 Bicrystals
Ist Teil von
Nano letters, 2015-06, Vol.15 (6), p.4129-4134
Ort / Verlag
United States: American Chemical Society
Erscheinungsjahr
2015
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Atomic-scale defects strongly influence the electrical and optical properties of materials, and their impact can be more pronounced in localized dimensions. Here, we directly demonstrate that strain triggers the formation of oxygen vacancies in complex oxides by examining the tilt boundary of SrTiO3 bicrystals. Through transmission electron microscopy and electron energy loss spectroscopy, we identify strains along the tilt boundary and oxygen vacancies in the strain-imposed regions between dislocation cores. First-principles calculations support that strains, irrespective of their type or sign, lower the formation energy of oxygen vacancies, thereby enhancing vacancy formation. Finally, current–voltage measurements confirm that such oxygen vacancies at the strained boundary result in a decrease of the nonlinearity of the I–V curve as well as the resistivity. Our results strongly indicate that oxygen vacancies are preferentially formed and are segregated at the regions where strains accumulate, such as heterogeneous interfaces and grain boundaries.
Sprache
Englisch
Identifikatoren
ISSN: 1530-6984
eISSN: 1530-6992
DOI: 10.1021/acs.nanolett.5b01245
Titel-ID: cdi_proquest_miscellaneous_1687653619
Format
–
Weiterführende Literatur
Empfehlungen zum selben Thema automatisch vorgeschlagen von bX