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Titolo:
Thermal vacancy formation and D0(3) ordering in nanocrystalline intermetallic (Fe3Si)(95)Nb-5 - art. no. 134114
Autore:
Pasquini, L; Rempel, AA; Wurschum, R; Reimann, K; Muller, MA; Fultz, B; Schaefer, HE;
Indirizzi:
Univ Stuttgart, Inst Theoret & Angew Phys, D-70569 Stuttgart, Germany UnivStuttgart Stuttgart Germany D-70569 hys, D-70569 Stuttgart, Germany Russian Acad Sci, Inst Solid State Chem, Sverdlovsk 620219, Russia RussianAcad Sci Sverdlovsk Russia 620219 hem, Sverdlovsk 620219, Russia Graz Tech Univ, Inst Tech Phys, A-8010 Graz, Austria Graz Tech Univ GrazAustria A-8010 Inst Tech Phys, A-8010 Graz, Austria Forschungszentrum Karlsruhe, Inst Nanotechnol, D-76021 Karlsruhe, Germany Forschungszentrum Karlsruhe Karlsruhe Germany D-76021 Karlsruhe, Germany CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125 Div Engn & Appl Sci, Pasadena, CA 91125 USA Univ Bologna, Dipartimento Fis, I-40127 Bologna, Italy Univ Bologna Bologna Italy I-40127 artimento Fis, I-40127 Bologna, Italy Ist Nazl Fis Mat, I-40127 Bologna, Italy Ist Nazl Fis Mat Bologna Italy I-40127 l Fis Mat, I-40127 Bologna, Italy
Titolo Testata:
PHYSICAL REVIEW B
fascicolo: 13, volume: 6313, anno: 2001,
pagine: 4114 -
SICI:
0163-1829(20010401)6313:13<4114:TVFADO>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON LIFETIME SPECTROSCOPY; GRAIN-BOUNDARIES; HIGH-TEMPERATURE; DIFFUSION; ALLOYS; FE3SI; SEGREGATION; DEPENDENCE; METALS; VOIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Pasquini, L Univ Stuttgart, Inst Theoret & Angew Phys, Pfaffenwaldring 57,D-70569 Stuttgart, Germany Univ Stuttgart Pfaffenwaldring 57 Stuttgart Germany D-70569 y
Citazione:
L. Pasquini et al., "Thermal vacancy formation and D0(3) ordering in nanocrystalline intermetallic (Fe3Si)(95)Nb-5 - art. no. 134114", PHYS REV B, 6313(13), 2001, pp. 4114

Abstract

The correlation between thermal vacancy characteristics and D0(3) orderingin ball-milled nanocrystalline (Fe3Si)(95)Nb-5 was studied by combined measurements of x-ray diffraction and positron annihilation. Structural stabilization due to grain boundary segregation of Nb enables high-temperature positron lifetime measurements up to 1023 K from which vacancy formation parameters identical to those in single-crystalline D0(3) Fe3Si are deduced. Measurements of coincidence Doppler broadening show that prior to the onset of thermal defect formation in the nanocrystallites, positrons are annihilated in Nb-enriched grain boundaries. The D0(3) ordering of the initially disordered Fe3Si nanocrystallites is discussed on the basis of the thermal vacancy characteristics and self-diffusion behavior.

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Documento generato il 30/03/20 alle ore 08:54:44