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.
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| 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). | ||||||||||||
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| 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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