Abstract
The elastic energy of a ferroelectric crystal in the vicinity of the transition has been examined. Assuming that the spontaneous strain along the ferroelectric axis compensates the electrostatic force due to the spontaneous field associated with the spontaneous polarization, the elementary charge associated with the unit cell dipole, and its displacement along the ferroelectric axis have been obtained. Specific consideration has been given to the case of triglycine sulphate, and expressions connecting the thermal expansion coefficients to the temperature dependence of the spontaneous polarization have been obtained. The elastic energy appears to be of the same order of magnitude as the purely electrostatic polarization energy.
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