Ferroelectric films of lead germanate prepared by modified chemical deposition techniques

Abstract

The high adhesive, single crystal lead germanate films of 5–105 μm in thick were fabricated on platinum substrates by in situ sol-gel technique. The stoichiometry of the films was closed to 5:3:11 without any oxygen deficiency. The microstructure of better films consisted of closed packed hexagonal crystals of 200–300 μm in size. Ferroelectric transition was sharp with Curie point 170–180°C, ϵ20=30–40, tgδ20≅0.02, ϵmax≅200, Ps=3.2 μC/cm2, Ec=16 kV/cm, ρ=108–109 Ωcm. All these parameters (with the exception of ϵmax) were in a good agreement with bulk single crystals ones.