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Synthetic Na-rich birnessite (NaBi) and its low pH form, hexagonal birnessite (HBi), were studied by X-ray and selected-area electron diffraction (XRD. SAED). SAED patterns were also obtained for synthetic Sr-exchanged bimessite (SrBi) microcrystals in which Sr was substituted for Na. XRD confirmed the one-layer monoclinic stmcture of NaBi and the one-layer hexagonal structure of HBi with subcell parameters a = 5.172 Å, b = 2.849 Å, c = 7.34 Å, β = 103.3° and a = 2.848 Å, c = 7.19 Å, γ = 120°, respectively. In addition to super-reflection networks, SAED patterns for NaBi and SrBi contain satellite reflections.

american mineralogist

Structure of synthetic monoclinic Na-rich birnessite and hexagonal birnessite: I. Results from X-ray diffraction and selected-area electron diffraction