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Equilibrium Polarization and Piezoelectric and Pyroelectric Coefficients in Poly(Vinylidene Fluoride)

机译：聚（偏氟乙烯）中的平衡极化和压电和热释电系数

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A recent series of papers by Purvis and Taylor has discussed in some detail the internal electric fields in an orthorhombic crystal composed of point dipoles. It was pointed out that the Lorentz factor L which describes the electric field at a site in terms of the influence of neighboring dipoles, may differ considerably from the value of 1/3 that i appropriate for cubic crystals. In the particular case of Beta-phase poly(vinylidene fluoride), of Beta-PVF2, the large anisotropy of this ferroelectric polymer was even found to give rise to a negative value of L. A calculation of the equilibrium polarization and of the piezoelectric and pyroelectric coefficients of Beta-phase poly(vinylidene fluoride) (PVF2) is presented. The effects of both the orthorhombic crystal structure and of the finite separation between the monopoles of the molecular dipole are taken into account. Good agreement is obtained with the experimentally measured polarization and piezoelectric and pyroelectric coefficients of Beta-PVF2 films.

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