This work describes an extensive study of the compound 11HFBBBM7*([1]), whi
ch presents the SmCalpha* phase in a relatively large temperature interval
(approximate to 3.3 degrees C). The polarization hysteresis loops obtained
at stabilized temperatures disclosed an antiferroelectric behaviour in the
high temperature range of the SmCalpha* phase. Dielectric dispersion was st
udied as a function of the bias field.