article
Crystal structure determinations of synthetic sodium, magnesium, and potassium birnessite using TEM and the Rietveld method
American Mineralogist · 1990 · Vol. 75 · pp. 477–489
Jeffrey E. Post✉David R. Veblen(Johns Hopkins University)
Abstract
Determination de la structure cristalline des sous-mailles des phases synthetiques analogues a la birnessite riches en Na, Mg et K. Cristallisation dans C2/m avec pour Na: a=5,175, b=2,850, c=7,337 A, β=103,18°; pour Mg: a=5,049, b=2,845, c=7,051 A, β=96,65°; pour K: a=5,149, b=2,843, c=7,176 A, β=100,76°. La structure generale de la birnessite est analogue a celle du chalcopanite. La surstructure proviendrait de l'ordonnation de l'eau et des cations dans les couches intermediaires, positions differentes dans les trois structures
Crystal Structures and PropertiesClay minerals and soil interactionsMineralogy and Gemology StudiesBirnessiteChemistryCrystal structureMagnesiumPotassiumCrystallographySodiumRietveld refinementNuclear chemistryMineralogy
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Cited by
Structure of synthetic monoclinic Na-rich birnessite and hexagonal birnessite; I, Results from X-ray diffraction and selected-area electron diffraction
American Mineralogist · 1997 · 398 citations
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Structure of synthetic monoclinic Na-rich birnessite and hexagonal birnessite; I, Results from X-ray diffraction and selected-area electron diffraction
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