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DOI: 10.1039/A604875G (Paper) Reference Section for: J. Mater. Chem., 1997, 7, 311-313

Anderson phases as precursors of nickel–molybdenum–tungsten oxides

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Piero Porta, Giuliano Minelli, Ida Pettiti, Lia I. Botto and Horacio J. Thomas

Abstract

Mixed Ni–Mo–W oxides have been prepared by decomposition at 873 K of Anderson-type [NiMo6-xWx O24H6 ](NH4)4 5H2O (x=0, 2, 3, 4, 6) heteropolyoxometallates. Thermal analysis of the precursors, X-ray diffraction and Raman spectroscopy on the mixed oxides were performed. X-Ray powder patterns, collected at the end of the thermal treatment, revealed that the final products are NiMoO4 and MoO3 for the x=0 composition, whereas for tungsten-containing materials the final products are Mo1-xWxO3 solid solutions, NiWO4 and WO3 , depending on the Mo/W atomic ratio. Raman spectra have confirmed the XRPD analysis, revealing the presence of a stable WO3-type phase at high molybdenum contents and a high structural stability of Mo1-xWxO3 solid solutions.

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