Ch. Riekel

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Olivine, Cation-Ordering, Mixed Crystals Mg2_a;Fe.rSi04 In annealed, synthetic samples of Mg2_aFe:cSi04 the Mg2+ and Fe2+ ions are not randomly distributed. With 0.1 sS x 5S0.6 the larger Fe2+ions replace preferentially Mg2+ in octahedral sites of symmetry m and the lattice dimensions do not change in this range. Quenching tends to yield samples with more(More)
The crystal structure of raite was solved and refined from data collected at Beamline Insertion Device 13 at the European Synchrotron Radiation Facility, using a 3 x 3 x 65 microm single crystal. The refined lattice constants of the monoclinic unit cell are a = 15.1(1) A; b = 17.6(1) A; c = 5.290(4) A; beta = 100.5(2) degrees; space group C2/m. The(More)
The intercalation compounds of layered dichalcogenides MX2 (M = transition metal, X = S, Se) with Lewis base guest molecules have received considerable attention due to their interesting physical properties and structural anisotropy [1]. The most simple molecule that is known to intercalate is the thermodynamically stable compound NH3; extensive work has(More)
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