Rietveld refinement of the coronadite structure

Jeffrey E. Post; David L. Bish

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Other| August 01, 1989

Rietveld refinement of the coronadite structure

Jeffrey E. Post;

Jeffrey E. Post

Department of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560, U.S.A.

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David L. Bish

Earth and Space Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A.

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Author and Article Information

Jeffrey E. Post

Department of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560, U.S.A.

David L. Bish

Earth and Space Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A.

Publisher: Mineralogical Society of America

First Online: 02 Mar 2017

Online ISSN: 1945-3027

Print ISSN: 0003-004X

American Mineralogist (1989) 74 (7-8): 913–917.

Abstract

Rietveld refinements using X-ray powder-diffraction data of coronadite samples from Morocco (Pb_1.06Ba_0.10Mn_7.7V_0.20Al_0.08O₁₆) and Australia (Pb_1.40Mn_7.9Al_0.05Zn_0.05O₁₆ · 1.55H₂O) in space group I2/m, a = 9.938(2) Å, b = 2.8678(5) Å, c = 9.834(2) Å, β = 90.39(2)° (Morocco) and a = 9.913(1) Å, b = 2.8652(4) Å, c = 9.843(1) Å, β = 90.20(1)° (Australia) confirm the basic hollandite structure. The Pb is displaced about 0.60 Å along the tunnels from the special position at (0, 0, 0). This displacement increases intercation distances in the tunnels, allowing up to two-thirds of the tunnel sites to be occupied by Pb cations