Electric field gradient tensors of57Fe in orthorhombic (Mg, Fe)SiO3
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A complete description of the electric field gradient (EFG) tensor at the M2 site of Fe2+ in a natural magnesium-rich orthopyroxene (orthoenstatite) was obtained from single-crystal Mössbauer spectra of57Fe. The sign ofV zz , asymmetry parameter η, and orientation of the tensor with respect to the crystallographic axesa, b andc were determined.V zz is positive, and its direction is about (±0.07). The data for the tensor at the M1 site of Fe2+ are less accurate.V zz at M1 may be assumed to be about parallel to the  direction. The results obtained for orthoenstatite are compared with the data of other pyroxenes.
KeywordsThin Film Field Gradient Electric Field Gradient Asymmetry Parameter Gradient Tensor
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