Abstract
The specific heat of RS was measured with a calorimetric system with double adiabatic shields. Near the two Curie points the measured values of CE show a slightly larger specific heat in the ferroelectric than in the paraelectric region. In order to check these results (CE - CD)/CD) was measured directly by means of the electrocaloric effect. This experiment confirmed the steplike behaviour and the positive sign of CE - CD at the two Curie points.