J. Phys. IV France 07 (1997) C1-607-C1-608
Fast Neutron Irradiated Magnetite and Haematite Investigated by Neutron DiffractionS. Meillon1, F. Dunstetter1, H. Pascard1 and J. Rodriguez-Carvajal2
1 Laboratoire des Solides Irradiés CEA - URA 1380 du CNRS, École Polytechnique 91128 Palaiseau cedex, France
2 Laboratoire LLB, CEN Saclay, 91191 Gif sur Yvette, France
In this paper, we present new experimental results about crystallographic and magnetic properties obtained on magnetite Fe3O4 and haematite α-Fe2O3 samples irradiated by fast neutrons. Polycrystalline rods were irradiated at 350K by fast neutrons inside the core of Melusine nuclear reactor (CENG) in Grenoble at various fluences (4 1019, 9.2 1019 and 20 1019 neutrons/cm2).The irradiated samples have been studied by the neutron diffraction technique. Contrary to the case of gamets ferrites, where amorphization is observed at such fluences, no similar effect is observed in magnetite : one just observes a very weak swelling. Results about haematite are also discussed.
© EDP Sciences 1997