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Modification of [FeO4] tetrahedral site number induced by fast-neutron irradiation in Y3Fe5O12 investigated by Mössbauer spectroscopy

1988; Elsevier BV; Volume: 65; Issue: 7 Linguagem: Inglês

10.1016/0038-1098(88)90371-7

1879-2766

Jean‐Marc Grenèche, H. Pascard, J. R. Régnard,

Glass properties and applications

Polycrystalline yttrium iron garnet Y3Fe5O12 discs were submitted to different fast-neutron irradiation doses and then were investigated by Mössbauer spectroscopy. An amorphization estimated at ≈20% in volume is observed on the highly irradiated sample; in this case, the hyperfine parameters, in particular the hyperfine field, are affected by the disorder originated by neutrons damage. Moreover, the number of [FeO4] tetrahedra is strongly reduced while that of [FeO6] octahedra remains approximately the same. Finally, one cannot conclude to a presence of Fe2+ from such a Mössbauer investigation.