The size effects of ferroelectric particles described by the transverse Isi
ng model have been studied taking into account the long-range interactions.
The size dependence of the mean polarization, Curie temperature, and the m
ean susceptibility, as well as the critical size of the particle, have been
obtained. The profile of the polarization is given. The size effects of th
e ferroelectric particle show a strong dependence on the interaction range.