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2005
Tungsten
I 5700
28- 021
Tungsten
New Route to Ordered Double Perovskites: Synthesis of Rock Salt Oxides,
Li4MWO6, and Their Transformation to Sr2MWO6 (M: Mg, Mn, Fe, Ni) via
Metathesis. — The compounds Sr2MWO 6 (M: Mg, Mn, Fe, Ni) are synthesized by solid state metathesis reactions of the new precursors Li4MWO6 (obtained from stoichiometric mixtures of LiCO3, MC2O4·2H2O, and WO3 at 600—900 °C) and SrCl2
(720—750 °C, 24—48 h). The samples are characterized by powder XRD, SEM, and
optical absorption spectroscopy. The compounds Li4MgWO6, Li4NiWO 6, Li 4MnWO6,
Sr2MgWO6, Sr 2MnWO6, and Sr2FeWO6 crystallize in the monoclinic space group
P21/n. Li4FeWO6 crystallizes in the triclinic space group P1 and Sr2NiWO6 in the tetragonal space group I4/m. — (MANDAL, T. K.; GOPALAKRISHNAN*, J.; Chem.
Mater. 17 (2005) 9, 2310-2316; Solid State Struct. Chem. Unit, Indian Inst. Sci.,
Bangalore 560 012, India; Eng.) — W. Pewestorf
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