Theory of compositionally graded ferroelectrics and pyroelectricity

Marvan, M.; Chvosta, P.; Fousek, J.
May 2005
Applied Physics Letters;5/30/2005, Vol. 86 Issue 22, p221922
Academic Journal
A thermodynamic theory of compositionally graded materials is developed, based on a term in the Landau formula for free energy of the form γPgradc, where P, c, and γ stand for the polarization, the atomic concentration, and a phenomenological coefficient, respectively. The consequence of this term is the following: (1) the original equivalence of two states with spontaneous polarization +PS and -PS is upset and the sample has the tendency to become oriented along one of the originally equivalent directions; (2) an additional polarization is induced. The consequences of the modified free energy for pyroelectricity are discussed.


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