OXYGEN DIFFUSIVITY IN MOO3 AS DETERMINED BY A TEMPERATURE-PROGRAMMED METHOD

A temperature programmed method for determining diffusivities has been previously applied to oxygen diffusivity in V2O5.(1) In this communic ation we extend the method to the case of oxygen diffusivity in MoO3. The reduction of MoO3 to MoO2 using NH3 is utilized to obtain experime ntal parameters such as the temperature of reduction and the activatio n energy for oxygen diffusion. These parameters are in turn used to so lve Fick's equation for the oxygen diffusivity D-0. The utility of thi s temperature programmed method for obtaining diffusivities has now be en clearly established by extension to MoO3.