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1 1998

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Possible lattice constribution to the mwchanism of the verwey transition of magnetite

Kąkol Z., Kozłowski A., Zalecki R., Knight K., Kim D., Honig J. M.

Electron Technology

1998

Vol. 31, No. 1

22-28

We report on systematic neutron differaction measurments of the crystal structure and lattice parameters as a function of tenperature for the Fe3-yZnyO4 series. The time-ofiflight data were collected in ISIS Rutheford Appleton Laboratory in a temperature range 4.2 K to 270 K for samples showing different orders of the Veswey transition. The change of transition order, resulting from doping, is accompanied by the clear difference in the characteristic, low temperature rhombohedral distortion. For samples exhibiting first-order transitions this distortion is nearly constant and much bigger than for samples showing second-order transitions where distortion diminishes with increasing doping levels. These observations, consistent with our recent heat capacity results, suggests that the lattice contribution should be considered in the analysis of possible interactions leading to the Verwey transition and to the change of its character with doping.