On the other hand, the aggregated particle at the boundary of
Al-rich region was magnified using transmission electron microscopy
(Fig. 3c). The selected area electron diffraction (SAED) pattern
of the BPOp is shown in the inset of Fig. 3c. We can find there is
some reaction product around BPOp particle. According to the
above analytical results, the chemical reaction between Al and
BPOp can be described by the following equation:
4Al þ 3BaPbO3 ! Ba3Al2O6 þ 3Pb þ Al2O3 ð1Þ