Pyroelectricity and compositionally graded ferroelectrics: a brief review of our theoretical approach.
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| Title: | Pyroelectricity and compositionally graded ferroelectrics: a brief review of our theoretical approach. |
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| Authors: | Marvan, M.1 (AUTHOR) marvan@kmf.troja.mff.cuni.cz, Fousek, J.1 (AUTHOR) |
| Source: | Phase Transitions. Jun/Jul2006, Vol. 79 Issue 6/7, p485-492. 8p. |
| Subjects: | Pyroelectricity, Crystallography, Ferroelectric crystals, Ferroelectricity, Polarization (Electricity) |
| Abstract: | In the last decade, the properties of compositionally graded ferroelectric films (CGFF) have become an essential and very often addressed research topic of ferroelectric materials. Many theoretical discussions of CGFF have been already presented, however there are several drawbacks. This is the summary of the main results of the authors: (a) it is essential that the classical Landau free energy density will be modified by an additional term of the γ P grad c type ( c is the composition ratio of different atoms), (b) the experimentally observed shift of hysteresis loop along the polarization axis must be necessarily described by a kinetic equation. Our approach is limited, being based on the assumption that CGFF is an ideally nonconductive material. In this article we compare our approach to the available theories which consider the CGFF to be a semiconductor. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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