Publication

Thermodynamics of single-domain BaTiO3 and PbTiO3 epitaxial thin films

Alexander Tagantsev
1998
Journal Articles

Abstract

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.

Official source

https://infoscience.epfl.ch/entities/publication/bc6ff7f5-1e42-4cae-9751-201c316df2df

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Alexander Tagantsev
1998
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/bc6ff7f5-1e42-4cae-9751-201c316df2df

About this result

Related concepts (32)

Piezoelectricity

Piezoelectricity (ˌpiːzoʊ-,_ˌpiːtsoʊ-,_paɪˌiːzoʊ-, piˌeɪzoʊ-,_piˌeɪtsoʊ-) is the electric charge that accumulates in certain solid materials—such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins—in response to applied mechanical stress. The word piezoelectricity means electricity resulting from pressure and latent heat. It is derived (an ancient source of electric current). The piezoelectric effect results from the linear electromechanical interaction between the mechanical and electrical states in crystalline materials with no inversion symmetry.

Strontium titanate

Strontium titanate is an oxide of strontium and titanium with the chemical formula SrTiO3. At room temperature, it is a centrosymmetric paraelectric material with a perovskite structure. At low temperatures it approaches a ferroelectric phase transition with a very large dielectric constant ~104 but remains paraelectric down to the lowest temperatures measured as a result of quantum fluctuations, making it a quantum paraelectric.

Thermodynamic equilibrium

Thermodynamic equilibrium is an axiomatic concept of thermodynamics. It is an internal state of a single thermodynamic system, or a relation between several thermodynamic systems connected by more or less permeable or impermeable walls. In thermodynamic equilibrium, there are no net macroscopic flows of matter nor of energy within a system or between systems. In a system that is in its own state of internal thermodynamic equilibrium, no macroscopic change occurs.

Related publications (32)

Thermodynamics of single-domain BaTiO3 and PbTiO3 epitaxial thin films

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