Abstract
Magnetic properties of orthoferrosilite FeSiO3 have been examined using susceptibility, magnetization measurements and Mossbauer spectroscopy. From magnetic and Mossbauer measurements, one obtains close values of the magnetic ordering temperature, TN=39±1 K and TN=41±1 K, respectively. The magnetic order is characterized by strong ferromagnetic coupling of Fe2+ moments within the ribbons and a weak antiferromagnetic coupling of the moments between adjacent ribbons. The 4.2 K Mossbauer spectra can be fitted with two different hyperfine magnetic fields Hhf=68 kOe and Hhf=314 kOe which can be assigned to Fe2+ in the octahedrally coordinated M1 and M2 sites, respectively, of the FeSiO3 structure.
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