Reference : Hydrothermal synthesis and crystal structure of Na(Na,Mn)(7)Mn-22(PO4)(18)0.5H(2)O, a...
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Physical, chemical, mathematical & earth Sciences : Chemistry
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Hydrothermal synthesis and crystal structure of Na(Na,Mn)(7)Mn-22(PO4)(18)0.5H(2)O, a new compound of fillowite structure type
Keller, Paul [> > > >]
Hatert, Frédéric mailto [Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie >]
Lissner, Falk [> > > >]
Schleid, Thomas [> > > >]
Fransolet, André-Mathieu mailto [Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie >]
European Journal of Mineralogy
E Schweizerbartsche Verlags
Yes (verified by ORBi)
[en] Na(Na,Mn)(7)Mn-22(PO4)(18)center dot 0.5H(2)O ; crystal structure ; fillowite ; phosphate minerals ; pegmatites
[en] The chemical compound Na(Na,Mn)(7)Mn-22(PO4)(18)center dot 0.5H(2)O was synthesized with a Tuttle pressure vessel at 800 degrees C and 1 kbar during experimental investigations on the conditions of fillowite formation. The crystal structure of a single-crystal, space group R (No. 148), a = 15.2741(9), c = 43.334(3) angstrom, Z = 6, was determined from X-ray intensity data and refined up to R-1 = 0.0728 and R-l{FO > 4 sigma(FO)} = 0.0546. The crystal structure of Na(Na,Mn)(7)Mn-22(PO4)(18)center dot 0.5H(2)O is similar to the structure of fillowite, Na6Ca3(Mn,Fe)(21)(PO4)(18.), but a significant difference between the synthetic H2O containing compound and fillowite is the replacement of (Na12)O-8(-) by Mn(H2O)(2)O-5(-) polyhedra, which form characteristic six-member rings. The coordination polyhedra around Na12 and Mn12 are so different that simple isomorphous substitution of Na12 by Mn12 is very unlikely, but whole six-member rings either of (Na12)O-8(-) or (Mn12)(H2O)(2)O-5 polyhedra seem to be distributed statistically over the crystal structure. No indication for ordering, e.g. sheet by sheet, has been observed. Na(Na,Mn)(7)Mn-22(PO4)(18)center dot 0.5H(2)O is the first fillowite-like compound for which water is located in the structure from single-crystal study. This result is proved by infrared spectral data and indicates that water can play an essential role in the fillowite structure-type. Structural features of the synthetic compounds Na(Na,Mn)(7)Mn-22(PO4)(18)center dot 0.5H(2)O, Na4Ca4Mg21(PO4)(18) and fillowite are compared.
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