Ferroelectric films of lead germanate prepared by modified chemical deposition techniques

The high adhesive. single crystal lead germanate films of 5-105 mum in thic k 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 deficien cy. The microstructure of better films consisted of closed packed hexagonal crystals of 200-300 mum in size. Ferroelectric transition was sharp with C urie point 170-180 degreesC. E-20=30-40, tg delta (20)=0.01, epsilon (max)= 200. P-s=3.2 muC/cm(2), E-c=16 kV/cm, rho =10(8)-10(9) Omega .cm. All these parameters (with the exception of epsilon (max)) were in a good agreement with bulk single crystals ones.