Effect of mechanical boundary conditions on phase diagrams of epitaxial ferroelectric thin films

A phenomenological thermodynamic theory of ferroelectric thin films epitaxially grow on cubic substrates is developed using a new form of the thermodynamic potential. which corresponds to the ac tual mechanical boundary conditions of the problem, For single-domain BaTiO3 and PbTiO3 films, the "misfit-temperature" phase diagrams are constructed. It is found that the 2D clamping of the films, apart from a shift of the temperature of the ferroelectric transition, results in a change of its order. A change of the sequence of the phases and the appearance of phases forbidden in the bulk crystals are predicted. [S0031-9007(98)05421-0].


Published in:
Physical Review Letters, 80, 9, 1988-1991
Year:
1998
ISSN:
0031-9007
Keywords:
Note:
Pertsev, Na Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia State Tech Univ, St Petersburg 195251, Russia Ecole Polytech Fed Lausanne, Lab Ceram, CH-1015 Lausanne, Switzerland
Yz785
Times Cited:284
Cited References Count:24
Laboratories:




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