The results of STA for the mixed oxide
composition of La1.9Sr0.1Mo1.7W0.3O9-δ are represented
in Figure 1. The weight loss mainly occurs in two
steps around 360 and 540°C with the total weight
loss of 8.8 wt%, which correspond to the endothermic
peaks in DTA curve. Similar results occur for
the other compositions of La2-xSrxMo2-yWyO9-δ.
Although the reactions complete before 800°C, the
actual calcined temperature to obtain a uniform
single phase for all compositions of La2-xSrxMo2-yWyO9-δ
is 950°C with a soaking time of 9 hrs and hold at
the temperatures which the reaction peaks occurred.