MICROWAVE CHEMISTRY

Project manager: Dr. Alexander Voloshko
Term: 2008
Support: National Academy of Sciences of Ukraine

The project is devoted to the development of new efficient and power-saving technologies of synthesis of binary inorganic oxides under microwave irradiation. The main attention of researchers is focused on tungstates of cadmium (CdWO₄), zink (ZnWO₄) and lead (PbWO₄) which are raw materials for growing of scintillating single crystals.

The project is divided into two mail parts:

• investigation of solid-phase microwave-assisted inorganic synthesis involving Me(NO₃)₂-(NH₄)₁₀W₁₂O₄₁, MeO-WO₃, and MeСO₃-WO₃ systems (Me = Cd, Pb, Zn);
• investigation of physicochemical properties of these oxides.

The solid-phase syntheses of binary oxides MeWO₄ are based on the following reactions:

• 12Me(NO₃)₂ + (NH₄)₁₀W₁₂O₄₁ -> 12MeWO₄ + 11NO₂ + 23NO + 20H₂O
• MeO + WO₃ -> MeWO₄
• MeСO₃ + WO₃ -> MeWO₄ + СО₂