Abstract
The conditions for the synthesis of aluminum tungstate Al2(WO4)3 and aluminum niobate AlNbO4 were clarified using hydrothermal treatment and post-heating. Single-phase Al2(WO4)3 can be synthesized through the hydrothermal treatment of the starting materials at a mixing ratio of Al:W = 5:5 at 250 °C for 5 h and post-heating at 840 °C for 6 h. The AlNbO4 was synthesized using the same method, under a hydrothermal treatment of Al:Nb = 2:8 and post-heating. As a result of investigating the products under various mixing conditions based on the synthesis of pure Al2(WO4)3 and AlNbO4, Nb could not be doped into Al2(WO4)3, but W-doped AlNbO4 was synthesized. The electric conductivity was measured for several samples of sintered W-doped AlNbO4, and the results showed that the electrical conductivity was improved within a higher temperature region by doping with W.
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