Synthesis and surface morphology of Europium and Lutetium heteropoly hexatungstonickelate (II)
Keywords:
heteropoly, heteropolyanion, Anderson structure, europium, lutetium, electron microscopyAbstract
The conditions for europium and lutetium heteropoly hexatungstonickelate (II) Ln4[Ni(OH)6W6O18]3·nH2O (Ln = Eu, Lu) synthesis by direct reaction in the system Ni2+ – WO4 2- – H+ – H2O (ν(Ni2+) : ν(WO4 2–) : ν(H+ ) = 1 : 6 : 6), and by an exchange reaction from Na4[Ni(OH)6W6O18]·16H2O were elaborated. By FTIR spectroscopy showed that the anions in the isolated salts corresponds to the Anderson structure [Ni(OH)6W6O18] 4–. The surface morphology of obtained salts was investigated by scanning electron microscopy. It was found that the way of obtaining is influence on the grain size – 100 –250 nm in the case of the direct reaction, and 200–400 nm in the case of the exchange reaction. Homogeneity of the obtained phase was confirmed by the uniform contrast of the surface mode of backscattered electrons.
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