Phase transformations in sol-gel prepared PZT and PLT thin films upon isothermal treatments at different temperatures

Phases formed upon isothermal treatments of sol-gel prepared PZT and PLT fi lms at different temperatures have been determined. In PZT, the sequence of phase formation with increased temperature is found to be: Amorphous --> A morphous + Pyrochlore + PbO --> Pyrochlore + PbO --> Pyrochlore + PbO + Per ovskite --> PbO + Perovskite --> Perovskite. In the PLT films no PbO phase is found to form and the region in which the pyrochlore phase forms is very limited. TTT diagrams for both the films are proposed.