On the Sol-Gel Preparation of Different Tungstates and Molybdates

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摘要：

The preparation and characterization of the M€-M€€-O nitrate-tartrate (M€ = Ca, Ba, Gd and M€ = W, Mo) precursor gels synthesized by simple, inexpensive, and environmentally benign aqueous sol-gel method is reported. The obtained gels were studied by thermal (TG/DSC) analysis. TG/DSC measurements revealed the possible decomposition pathway of synthesized M€-M€€-O nitrate-tartrate gels. For the synthesis of different metal tungstates and molybdates, the precursor gels were calcined at different temperatures (650, 800, and 900 °C). According to the X-ray diffraction (XRD) analysis data, the crystalline compounds CaMoWO doped with Ce ions, BaMoWO doped with Eu ions and GdMoO were obtained from nitrate-tartrate gels annealed at 650-900 °C temperatures. The XRD data confirmed that the fully crystalline single-phase powellite, scheelite, or Gd(MoO) structures were formed already at 650 °C. Therefore, the suggested sol-gel method based on the complexation of metal ions with tartaric acid is suitable for the preparation of mixed tungstates-molybdates at relatively low temperature in comparison with solid-state synthesis.

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关键词：

Sol–gel synthesis Precursors TG DSC Tungstates Molybdates

DOI：

10.1007/s10973-011-1367-2

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年份：

2011