Some Magnetic Properties of Fe2SiO4 from 4°K to 300°K

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Abstract
Mössbauer spectra of 57Fe in Fe2SiO4, which has iron atoms in two distinct crystallographic sites, have been obtained from 9°K to 300°K, a temperature range in which two magnetic transitions occur as indicated by magnetic susceptibility measurements. Above the first transition temperature, 66°K, the spectra consist of a pure quadrupole split line. Below this temperature Zeeman splitting is observed, resulting in composite spectra attributed to the two different iron sites. Magnetization curves indicate the presence of weak ferromagnetism between 66°K and the second transition temperature, 20°K. Below the second transition temperature Fe2SiO4 is an ideal antiferromagnet. The hyperfine spectra were analyzed by numerical solution of the complete interaction Hamiltonian. From this analysis values of the magnetic fields, the electric field gradients, and their relative orientations are obtained. These results are compared with the spin assignments that have been made on the basis of neutron diffraction studies.

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