This work explored the use of Ni foils, Ag foils and Cu foils as substrates for the PZT films. Ni foils (25 mm, 99.99+%, Goodfellow Corporation, Coraopolis, PA) oxidize easily; if the oxygen partial pressure during firing is low enough to retain metallic Ni, Pb is reduced. LaNiO3/HfO2/Ni substrates were used to suppress the formation of NiO and reduce contact between Ni and PZT. Here HfO2 was the passivation layer while LaNiO3 (LNO) served as the bottom electrode. The processing details were similar to those described by Yeo et al. [44] except that 100 nm HfO2 was deposited by atomic layer deposition at a rate of 0.93 A-/cycle. The silver foils (25 mm, 99.9%, SigmaAldrich Corp., St. Louis, MO) were cut to size and used without any further treatment. 5 layers (~100 nm) of PbO thin film were spun on to the surface of the Cu foils (25 mm, 99.8%, Alfa Aesar, Tewksbury, MA), following procedures described by Coleman et al. [45] to help provide a transient liquid phase, but no additional processing was required..