Abstract
Manganese and iron orthosilicate are isomorphous with the mineral olivine and are antiferromagnetic at low temperatures. Susceptibility data in the paramagnetic region show Curie-Weiss law behavior ( p eff = 5.86 μ B, θ = 163°K for Mn 2SiO 4, and 6.03μ B, 126°K for Fe 2SiO 4)and two transitions occur at lower temperatures. Fe 2SiO 4 transforms to a collinear antiferromagnet at 65°K and then to a partially canted arrangement near 23°K; for Mn 2SiO 4 the transition temperatures are near 50 and 13°K. Theoretical calculations based on the Lyons-Kaplan and molecular field methods are in agreement with the neutron diffraction results.
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