Browsing by Author "Redhammer G.J."
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Browsing by Author "Redhammer G.J."
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Redhammer G.J.; Roth G. (2002)The crystal structure of a synthetic potassic-ferri-ferrorichterite, ideally K(Ca0.5Na1.5)Fe5Si8O22(OH)(2) was refined from single-crystal X-ray imaging plate diffraction data at 298 K and I 10 K. The title compound is ...
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Grodzicki M.; Redhammer G.J.; Amthauer G.; Schunemann V. (2003)The Fe end-members scorzalite [Fe2+ Al2 3+ (PO4)2(OH)2] and barbosalite [Fe 2+ Fe2 3+ (PO4)2(OH)2] of the lazulite series have been investigated by Mössbauer and diffuse reflectance spectroscopy, and by electronic structure ...
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Mercier P.H.J.; Rancourt D.G.; Robert J.-L.; Berman R.G.; Redhammer G.J. (2005)Based on powder X-ray diffraction (pXRD) measurements of many mica solid solution series of synthetic powder samples (between Mg, Co, Ni, and Fe end-members, with different degrees of oxidation, vacancy, and Al/Si contents, ...
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Grew E.S.; Redhammer G.J.; Amthauer G.; Cooper M.A.; Hawthorne F.C.; Schmetzer K. (1999)Iron is an important constituent of kornerupine, (,Mg,Fe)(Al,Mg,Fe) 9 (Si,Al,B) 5 O 21 (OH,F). We obtained Mössbauer spectra at 300 K on twelve samples with Fe 0.30–1.30 atoms per formula unit (apfu) and Fe 3 /Fe 0–0.31; ...
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Zhang M.; Salje E.K.H.; Mookherjee M.; Redhammer G.J. (2002)Synthetic aegirine LiFeSi2O6 and NaFeSi2O6 were characterized using infrared spectroscopy in the frequency range 50–2000 cm−1, and at temperatures between 20 and 300 K. For the C2/c phase of LiFeSi2O6, 25 of the 27 predicted ...
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Della Ventura G.; Iezzi G.; Novembre D.; Redhammer G.J.; Hawthorne F.C.; Scaillet B. (2005)This paper reports the results of hydrothermal synthesis in the system Na2O-MgO-FeO-Fe2O3-SiO2-H2O. Four samples of stoichiometric magnesioriebeckite composition, ideally □Na2Mg3Fe3+2 Si8O22(OH)2, were run at 700–800 °C, ...
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Redhammer G.J.; Roth G.; Paulus W.; Andre G.; Lottermoser W.; Amthauer G.; Treutmann W.; Koppelhuber-Bitschnau B. (2001)Single crystals of Li-aegirine LiFe3+Si2O6 were synthesized at 1573 K and 3 GPa, and a polycrystalline sample suitable for neutron diffraction was produced by ceramic sintering at 1223 K. LiFe3+Si2O6 is monoclinic, space ...
Now showing items 1-7 of 7