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Rhombohedral Distortion in Fe_{3-y}Zn_{y}O_{4} at Verwey Transition

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Kozłowski A., Kąkol Z., Zalecki R., Knight K., Honig J. M.
Acta Physica Polonica A
|
1997
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vol. 91
|
issue 2
443-446
EN
The time-of-flight neutron diffraction data were collected for two Fe_{3-y}Zn_{y}O_{4} powder samples showing different order of the Verwey transition: y=0.0072 - first order, y=0.0249 - second order. Measurements were performed on spallation neutron source in ISIS Rutherford Appleton Laboratory. At low temperatures (below Verwey transition temperature T_{V}) clear splitting of certain reflections characteristic of rhombohedral distortion was observed for both samples. We found that this distortion is much bigger for the sample exhibiting first-order than for the sample showing second-order transition.
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