Cation ordering in NiAl2O4 spinel by a 111 systematic row CBED technique |
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Authors: | Y Tabira R L Withers |
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Institution: | (1) Research School of Chemistry, Australian National University Canberra, A.C.T., 0200, Australia Fax: (61) 2 6249 0750, AU |
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Abstract: | A focussed probe wide angle systematic row CBED technique has been used to determine the degree of cation inversion, i.e.
the magnitude of the cation ordering parameter x, in (Ni1−
x
Al
x
) Ni
x
/2Al1−
x
/2]2O4 spinel to an estimated accuracy of ±0.1. For comparison purposes, the same technique has also been applied to an MgCr2O4 spinel (where very little cation inversion is expected). The simplicity of this CBED technique in conjunction with the fact
that the experimental data can be obtained from small illuminated areas several tens to 100 nm in diameter, suggests that
it may be a very useful technique for estimating the extent of cation inversion in multi-phase mineralogical specimens containing
spinels.
Received: 19 October 1998 / Revised, accepted: 14 June 1999 |
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Keywords: | Cation ordering Spinel Convergent beam electron diffraction |
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