Thermodynamics of single-domain BaTiO3 and PbTiO3 epitaxial thin films
A phenomenological thermodynamic theory of ferroelectric thin films epitaxially grown on cubic substrates is developed using a new form of the Gibbs function, which corresponds to the actual mechanical boundary conditions of the problem. It is found that the 2D-clamping of the films results not only in a shift of the transition temperature but also in a change of its order. For single-domain BaTiO3 and PbTiO3 films, the "misfit strain-temperature" phase diagram is constructed. For PbTiO3 films, the existence of a phase forbidden for the crystals is predicted. The intrinsic piezoelectric response of BaTiO3 films is calculated as a function of the misfit strain.
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Tagantsev, AK Ecole Polytech Fed Lausanne, Lab Ceram, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne, Lab Ceram, CH-1015 Lausanne, Switzerland AF Ioffe Physicotech Inst, St Petersburg 194021, Russia State Tech Univ St Petersburg, St Petersburg 195251, Russia
Part 4 Suppl. S
Cited References Count:14
Record created on 2006-08-21, modified on 2016-08-08