Název:
Structure and magnetism of clean and impurity-decorated grain boundaries in nickel from first principles
Autoři:
Všianská, Monika ; Šob, Mojmír Typ dokumentu: Příspěvky z konference Konference/Akce: Pracovní setkání fyzikálních chemiků a elektrochemiků /11./, Brno (CZ), 2011-06-01 / 2011-06-02
Rok:
2011
Jazyk:
eng
Abstrakt: We present a detailed theoretical study of segregation of sp-elements from the 3rd-5th period (Al, Si, P, S, Ga, Ge, As, Se, In, Sn, Sb and Te) at the Sigma5(210) grain boundary (GB) in fcc FM Ni. Whereas there is a slight enhancement of magnetization at the clean GB and FS with respect to bulk nickel (3–7% and 24%, respectively), the studied impurities entirely kill or strongly reduce ferromagnetism at the GB so that magnetically dead layers are formed. We determine the preferred segregation sites at the GB for the impurities studied, their segregation enthalpies and strengthening/embrittling energies. We find interstitially segregated Si and P and substitutionally segregated Al as a GB cohesion enhancer, and interstitially segregated S, Ge, As, Se and substitutionally segregated Ga, In, Sn, Sb and Te as GB embrittlers in Ni. As there is very little experimental information on GB segregation in nickel most of the present results are theoretical predictions which may motivate future experimental work.
Klíčová slova:
grain boundary; magnetism; nikel; segregation Číslo projektu: CEZ:AV0Z20410507 (CEP), IAA100100920 (CEP), GD106/09/H035 (CEP) Poskytovatel projektu: GA AV ČR, GA ČR Zdrojový dokument: XI. Pracovního setkání fyzikálních chemiků a elektrochemiků, ISBN 978-80-7375-514-0
Instituce: Ústav fyziky materiálů AV ČR
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Informace o dostupnosti dokumentu:
Dokument je dostupný v příslušném ústavu Akademie věd ČR. Původní záznam: http://hdl.handle.net/11104/0201323