Abstract
The irreversible transition for octahedral Fe3+ ion in Nd3Fe5O12 garnet from low-spin (LS) (S = 1/2) state to high-spin (HS) state (S = 5/2) was induced by increasing temperature. The experimental value of entropy change of LS–HS transition is in good agreement with theoretical estimations. The crystal structure is stable below 873 K. The spin state transition corresponds to the changes of the observed magnetization and Curie temperature of Nd3Fe5O12, in which saturated magnetization is consistent with calculating value. The increase of the Curie point indicates that the change of spin state results in strength in energy of superexchange interaction between two kinds of iron ions.
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