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Simplifying the theory of the Invar effect in iron-nickel alloys

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If you have a question about this talk, please contact Dr Jonathan Keeling .

Zero-temperature ab initio calculations of the lattice spacing of disordered iron-nickel alloys are presented. These show a strong negative correlation between the lattice spacing and the number of nearest-neighbour iron-iron pairs with antiparallel local moments. Based on the conjecture that this correlation persists at non-zero temperature, a simple theory is formulated that reproduces several experimental results on this class of Invar materials. We conclude that an alloy shows the Invar effect if the concentration of such pairs increases sufficiently rapidly over a broad interval of temperature.

Some of this work is available as a preprint, arXiv:0811.3673.

This talk is part of the Irregular seminars in TCM series.

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Vectura 205 Cambridge Science Park Milton Rd Cambridge CB4 0GZ Chemistry Departmental-wide lectures Donald McIntyre Building, Faculty of Education, 184 Hills Road, Cambridge, room 2S8

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