Interdiffusion in a superlattice: an exploratory nuclear magnetic resonance study
Autor: | D St P Bunbury, M R Wells, M A H McCausland, J W Ross, Yang Li, R C C Ward |
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Rok vydání: | 1997 |
Předmět: | |
Zdroj: | Journal of Physics: Condensed Matter. 9:6301-6311 |
ISSN: | 1361-648X 0953-8984 |
DOI: | 10.1088/0953-8984/9/29/015 |
Popis: | We have carried out an exploratory NMR study of interdiffusion at interfaces between epitaxially grown laminae of rare-earth metals. The system investigated was a terbium - yttrium superlattice grown by molecular-beam epitaxy at . The NMR spectrum of shows satellites associated with Tb ions with different numbers of Y neighbours and therefore provides information about the yttrium concentration profile resulting from interdiffusion. Our data are interpreted in terms of a model based on thermally activated diffusion and which allows for the progressive decrease in , the RMS diffusion length, from the lowest to the highest interface. The diffusion coefficient, provisionally assumed to be independent of composition, is found to be at the growth temperature. |
Databáze: | OpenAIRE |
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