Rietveld refinement of the coronadite structure

Journal Article · · American Mineralogist; (USA)

OSTI ID:7121508

Post, J E ^[1]; Bish, D L ^[2]

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1. Smithsonian Institution, Washington, DC (USA)
2. Los Alamos National Laboratory, NM (USA)

Rietveld refinements using X-ray powder-diffraction data of coronadite samples from Morocco (Pb{sub 1.06}Ba{sub 0.10}Mn{sub 7.7}V{sub 0.20}Al{sub 0.08}O{sub 16}) and Australia (Pb{sub 1.40}Mn{sub 7.9}Al{sub 0.05}Zn{sub 0.05}O{sub 16}{center dot}1.55H{sub 2}O) in space group I2/m, a = 9.938(2) {angstrom}, b = 2.8678(5) {angstrom}, c = 9.834(2) {angstrom}, {beta} = 90.39(2){degree} (Morocco) and a = 9.913(1) {angstrom}, b = 2.8652(4) {angstrom}, c = 9.843(1) {angstrom}, {beta} = 90.20(1){degree} (Australia) confirm the basic hollandite structure. The Pb is displaced about 0.60 {angstrom} 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.

• OSTI ID: 7121508
• Journal Information: American Mineralogist; (USA), Journal Name: American Mineralogist; (USA) Vol. 74:7-8; ISSN AMMIA; ISSN 0003-004X
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AFRICA
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALUMINIUM
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AUSTRALASIA
AUSTRALIA
BARIUM
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DEVELOPING COUNTRIES
DIFFRACTION
ELECTRON MICROPROBE ANALYSIS
ELEMENTS
HOLLANDITE
LEAD
MANGANESE COMPOUNDS
MANGANESE OXIDES
METALS
MICROANALYSIS
MINERALS
MOROCCO
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM
X-RAY DIFFRACTION