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Thermal vacancy formation and D03 ordering in nanocrystalline intermetallic (Fe3Si)95Nb5

Pasquini, L. and Rempel, A. A. and Würschum, R. and Reimann, K. and Müller, M. A. and Fultz, B. and Schaefer, H.-E. (2001) Thermal vacancy formation and D03 ordering in nanocrystalline intermetallic (Fe3Si)95Nb5. Physical Review B, 63 (13). Art. No. 134114. ISSN 0163-1829. https://resolver.caltech.edu/CaltechAUTHORS:PASprb01

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Abstract

The correlation between thermal vacancy characteristics and D0(3) ordering in 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.


Item Type:Article
ORCID:
AuthorORCID
Fultz, B.0000-0002-6364-8782
Additional Information:© 2001 The American Physical Society. Received 22 September 2000; revised 15 December 2000; published 15 March 2001. We thank W. Sprengel and M. Eggersmann for helpful discussion and N. Karl for providing the opportunity to perform the x-ray measurements. This work was financially supported by the University of Bologna (L.P.), Max-Planck-Gesellschaft and RFBR Grant No. 99-03-32208a (A.A.R.), Deutsche Forschungsgemeinschaft (Grants Scha428/8-2, 25-1), and European Union (Grant INTAS99-1216).
Funders:
Funding AgencyGrant Number
University of BolognaUNSPECIFIED
Max-Planck-GesellschaftUNSPECIFIED
Russian Foundation for Basic Research99-03-32208a
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
European UnionINTAS99-1216
Subject Keywords:POSITRON LIFETIME SPECTROSCOPY; GRAIN-BOUNDARIES; HIGH-TEMPERATURE; DIFFUSION; ALLOYS; FE3SI; SEGREGATION; DEPENDENCE; METALS; VOIDS
Issue or Number:13
Record Number:CaltechAUTHORS:PASprb01
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:PASprb01
Alternative URL:http://dx.doi.org/10.1103/PhysRevB.63.134114
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3688
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Jun 2006
Last Modified:02 Oct 2019 23:05

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