Re: Crystal structures of pyroaurite and sjoegrenite

Journal Article · Sun Dec 31 04:00:00 EST 1995 · Advances in X-Ray Analysis

DOI:https://doi.org/10.1007/978-1-4615-1797-9_91· OSTI ID:369879

Olowe, A ^[1]

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1. Western Michigan Univ., Kalamazoo, MI (United States)

Pyroaurite and sjogrenite belong to the group of sandwiched lamellar metal hydroxides which sj have a fixed metallic ions M{sup II}:M{sup III} ratio for a particular class. Their crystal structure consists of positively charged metal hydroxide blocks intercalated with negatively charged interlayers. The atomic positions for the interlayer are definite for a particular class. The exact chemical formula of the pyroaurite class is determined from crystal structure analysis to be M{sup II} {sub 6}M{sup III} {sub 2}(OH){sub 16}CO{sub 3} 4.5H{sub 2}O; it crystallizes in the space group R{anti 3}m with a = 12.4376 {Angstrom} and c 23.4126 {Angstrom}. Sjogrenite, M{sup II} {sub 6}M{sup III} {sub 2}(OH){sub 16}CO{sub 3} 4H2O crystallizes in the space group P6ER mcm. The crystallography and structural relationship between these classes are discussed. Previous discussion on these compounds did not give any conclusion on the exact chemical formula and the atomic positions.

• Sponsoring Organization: USDOE
• OSTI ID: 369879
• Report Number(s): CONF-9408178--
• Journal Information: Advances in X-Ray Analysis, Journal Name: Advances in X-Ray Analysis Vol. 38; ISSN AXRAAA; ISSN 0376-0308
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
CRYSTAL STRUCTURE
HYDROXIDES
INTERMETALLIC COMPOUNDS
X-RAY DIFFRACTION