Bastow, T.J. and Smith, M.E. and West, G.W. (1997) Al-27 nuclear magnetic resonance detection of diffusion processes in Ni1-xAlx (0.46<=x<=0.54) and Ni2Al3. Journal of Physics-Condensed Matter, 9 (28). pp. 6085-6095. ISSN 0953-8984.
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The alloy system Ni1-xAlx has been investigated by means of Al-27 NMR around the equiatomic region where x = 0.5, and at x = 0.6, which gives the trigonal ordered compound Ni2Al3. For Ni2Al3, two At sites were clearly resolved at room temperature by means of their characteristic second-order quadrupolar structure. NMR spectra for cubic Ni1-xAlx taken at temperatures up to 960 degrees C show rapid Al-27 Line narrowing above similar or equal to 600 degrees C for x = 0.54 (indicative of diffusion processes), but no such line narrowing was observed up to 960 degrees C for x = 0.50 or x = 0.48. Ni-61 NMR results are also reported for the equiatomic alloy. For Ni2Al3, the Al-27 NMR powder pattern evolved smoothly into that characteristic of one well defined site as the temperature was raised to 820 degrees C although no phase transition was detected by means of powder x-ray diffraction or thermal analysis. These observations are discussed qualitatively in terms of defect-assisted diffusion processes.
|Depositing User:||T. Nasir|
|Date Deposited:||29 Oct 2009 09:03|
|Last Modified:||29 Oct 2009 09:03|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/18276 (The current URI for this page, for reference purposes)|
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