Pb3Fe3+2(PO4)4(H2O), a new octahedral-tetrahedral framework structure with double-strand chains
- Autor(en)
- Stuart J. Mills, Uwe Kolitsch, Ritsuro Miyawaki, Frederic Hatert, Glenn Poirier, Anthony R. Kampf, Satoshi Matsubara, Ekkehart Tillmanns
- Abstrakt
A new lead iron(III) hydrated phosphate, Pb3Fe2(PO4)4(H2O), has been synthesised hydrothermally in Teflon-linedstainless steel autoclaves at 220 _C for 7 days, with an initial pH of 1.5. It is the first example of a synthetic hydrous Pb-Fe3þphosphate. Crystals are small, colourless to white prisms, uniaxial (þ) and non-pleochroic. The calculated refractive index for whitelight is n ¼ 1.95. Single-crystal structure determination (R(F) ¼ 0.0457) shows Pb3Fe2(PO4)4(H2O) to be tetragonal, space groupP41212 (no. 92), with a ¼ 9.0440(10), c ¼ 16.766(3)A ° , V ¼ 1371.4(3)A ° 3 and Z ¼ 4. Pb3Fe2(PO4)4(H2O) has a structure type which isbased on a tetrahedral-octahedral framework of FeO6 octahedra sharing corners with PO4 tetrahedra, with Pb atoms and H2Omolecules occupying voids in the framework. Pb3Fe2(PO4)4(H2O) is homeotypic with synthetic Pb3Cr2(PO4)4; both compounds sharethe same heteropolyhedral topology and the same space group, but only Pb3Fe2(PO4)4(H2O) contains an additional position occupiedby a water molecule. The octahedral-tetrahedral chain of Pb3Fe2(PO4)4(H2O) is topologically similar to double-strand chains foundin the structures of hannayite, galliskiite, kapundaite, PbIn(AsO4)(AsO3OH) and Na2.88Fe(PO4)2. Infrared spectroscopy is used todescribe the vibrational properties of Pb3Fe2(PO4)4(H2O).
- Organisation(en)
- Institut für Mineralogie und Kristallographie
- Externe Organisation(en)
- Museums Victoria, Naturhistorisches Museum Wien (NHM), National Museum of Nature and Science, Université de Liège, Canadian Museum of Nature, Natural History Museum of Los Angeles County
- Journal
- European Journal of Mineralogy: an international journal of mineralogy, geochemistry and related sciences
- Band
- 22
- Seiten
- 595-604
- Anzahl der Seiten
- 10
- ISSN
- 0935-1221
- Publikationsdatum
- 2010
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105113 Kristallographie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/03a49180-08cc-4d4e-940c-321d7b52bbc2