Thermal decomposition behavior of metal-oxygen clusters with Keggin structure

In this paper, the thermal decomposition behavior of the polyoxometalates with a Keggin structure Y_mH_nXM₁₂O₄₀(X = P, Si, Ge; M = W, Mo, Y = NH₄⁺, K⁺, Cu²⁺) was investigated systematically by using X-ray diffraction and IR spectra at different temperatures, TG-DTA and solubility experiment methods. Their precisely decomposed temperatures were obtained, and the procedure of decomposition was also explored. The determinant eriterions of the thermal decomposition and the factors affecting the thermal property of the polyoxometalates were discussed and some new views were presented. At the same time, the main decomposition products of the prepared polyoxometalates were identified by XRD.