Al-27 nuclear magnetic resonance detection of diffusion processes in Ni1-xAlx (0.46<=x<=0.54) and Ni2Al3

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. (The full text of this publication is not available from this repository)

The full text of this publication is not available from this repository. (Contact us about this Publication)

Abstract

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.

Item Type: Article
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)
  • Depositors only (login required):