Studies on the reaction kinetics and mechanism of the synthesis of the Zn2.5VMoO8 compound in the solid state have been carried out in situ in a high-temperature X-ray diffraction attachment. The apparent
activation energy, 21226 kJ mol-1 was calculated by using the diffusion controlled Ginstling-Brounstein model. There was also determined a temperature dependence
of unit cell parameters for Zn3V2O8 and Zn2.5VMoO8.