The structure of okayamalite from Arendal, Norway, was refined using the Rietveld method, with CoKα powder X-ray diffraction data (R(F) = 3.69%). Okayamalite exhibits a melilite-type structure, space group P4̄21m, with cell edges a = 7.1248(2), c = 4.8177(2) Å. Si and B are ordered on the T1 and T2 sites respectively, in agreement with the refined tetrahedral distances (<T1-O> = 1.657 Å and <T2-O>=1.498 Å). In comparison with the other melilite-type compounds, the cation population in okayamalite leads to the minimum structural misfit between tetrahedral and square-antiprism layers.

Rietveld refinement of okayamalite, CA2SiB2O7: structural evidence for the B/Si ordered distribution

GIULI, Gabriele;
2000-01-01

Abstract

The structure of okayamalite from Arendal, Norway, was refined using the Rietveld method, with CoKα powder X-ray diffraction data (R(F) = 3.69%). Okayamalite exhibits a melilite-type structure, space group P4̄21m, with cell edges a = 7.1248(2), c = 4.8177(2) Å. Si and B are ordered on the T1 and T2 sites respectively, in agreement with the refined tetrahedral distances ( = 1.657 Å and =1.498 Å). In comparison with the other melilite-type compounds, the cation population in okayamalite leads to the minimum structural misfit between tetrahedral and square-antiprism layers.
2000
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/115705
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