Simultaneous synthesis of molybdenum carbides and titanium carbides by sol–gel method

Abstract

The research on simultaneous synthesis of molybdenum carbides and of titanium carbides by sol–gel method was conducted. (NH4)6Mo7O24·4H2O and Ti[O(CH2)2CH3]4 were applied as precursors. The gaseous products were determined using mass spectrometry method. The phase composition of samples was identified by XRD method, and their morphology was examined by SEM method. After the hydrolysis of Ti[O(CH2)2CH3]4 nanometric TiO2 was received. Before the synthesis (NH4)6Mo7O24·4H2O decomposed into MoO3 (t ≤ 673 K). At the temperature of 689–943 K MoO3 was reduced into MoO2 (or also into Mo). The synthesis of Mo2C proceeded at the temperature of 973–1,189 K. In this temperature range also reduction of TiO2 into TixOy took place. The synthesis of titanium carbides proceeded at the temperature t ≥ 1,285 K.