Thermal-Behavior Of (Nh4)3vo2f4 And Na(Nh4)2vo2f4

The thermal behaviour of (NH 4 ) 3 VO 2 F 4 and Na(NH 4 ) 2 VO 2 F 4 was investigated using TG, DTA and DSC techniques. The occurrence of a first order phase transition with the onset of decomposition in both the compounds is confirmed. The temperature, energetics and hysteresis of the transition are obtained. A possible path for the thermal degradation is given for both the compounds, and the residues are identified.