New -type layered vanadium bronzes M 0.25 V 2 O 5 • H 2 O were hydrothermally synthesized for divalent metals of M ؍ Mg, Co, Ni in addition to the first-reported M ؍ Zn compound. The -type structures, consisting of V 2 O 5 layers with three octahedral and one tetrahedral V atoms and interlayer M
Crystal structure of a vivianite-type mineral: Mg-rich erythrite, (Co2.16Ni0.24Mg0.60)(AsO4)2 · 8 H2O
✍ Scribed by Capitelli, Francesco; Elaatmani, Mohamed; Lalaoui, My Driss; Piniella, Juan F.
- Book ID
- 119955683
- Publisher
- Oldenbourg Wissenschaftsverlag
- Year
- 2007
- Tongue
- English
- Weight
- 117 KB
- Volume
- 222
- Category
- Article
- ISSN
- 2194-4946
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✦ Synopsis
The crystal structure of erythrite from Bouzaer, south Morocco, was refined through single crystal X-ray diffraction data, within monoclinic space group __C__2/m, with the following unit cell constants: a = 10.187(1) Å, b = 13.470(1) Å, c = 4.755(1) Å, β = 104.971(2)°, V = 630.3(2) Å^3^. Transition metal and magnesium cations are randomly distributed over two special positions Me(1) and Me(2), making up single and dimerical octahedral groups, connected by (AsO~4~) tetrahedra groups, in order to form infinite sheets down b. Such sheets are held together within the three-dimensional framework owing to the presence of an intricate hydrogen bond network. An infrared spectrum was collected in order to achieve information on the HOH bending modes of the erythrite.
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