The growth of PbTi03 films by a metalorganic chemical-vapor-deposition technique has resulted in three-dimensionally epitaxial heterostructures on various single-crystal substrates. These heterostructures consist of PbTi03 films on the (001) surface of the single crystals: potassium tantalate (KTa03), strontium titanate (SrTi03), and magnesium oxide (MgO). It was found that the presence of a structural (ferroelectric) phase transition in PbTi03 leads to a "strain-accommodating" mechanism in which a domain pattern forms as the system cools through the Curie temperature and limits the extension of interfacial strain in the heterostructurethus minimizing the total energy of the heterostructure. ForPbTi03/KTa03 (001), the interfacial strain is accommodated by the formation of a periodic domain pattern in the overlayer. In PbTi03/Sr Ti03 (001), which exhibits an excellent lattice match between respective a lattice parameters, the film exists as a single c domain. The PbTi03/MgO(001) system, having a poor lattice match for both the a and c axes, appears to find the energy minimum by locking into domains of two-dimensional superlattices with the greatest atomic coincidences. It is found that the nature of the domain pattern depends very strongly on both the film thickness and measuring temperature.A theoretical model of the domain-pattern formation has been developed by using linear-elasticity theory and a Landau-Ginzburg-Devonshire-type phenomenological theory for the substrate and the overlayer, respectively. The theoretical predictions and the experimental measurements were in good agreement in both the thickness and temperature dependence of the relative domain population and the spontaneous strains.

We have noticed the following misprints in our paper:2. Page 2, right column, 8th line from the bottom: it should be 2⍀ ± = + + ⌫ + ± ⍀ 0 instead of ⍀ ± = + + ⌫ + ± ⍀ 0 .

Fatigue and retention characteristics of ferroelectric lead zirconate titanate thin films grown with Y-Ba-Cu-O(YBCO) thin-film top and bottom electrodes are found to be far superior to those obtained with conventional Pt top electrodes. The heterostructures reported here have been grown in situ by pulsed laser deposition on yttria-stabilized ZrO2 buffer [100] Si and on [001] LaAlO3. Both the a- and c-axis orientations of the YBCO lattice have been used as electrodes. They were prepared using suitable changes in growth conditions.

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