We investigated the doping effect of non-liquid crystal on the phase sequence of R-MHPOBC. The phase sequence is drastically changed by doped 4-dimethylamino-4'-nitrostilbene (DANS). At 5wt% of DANS, the phase sequence is as follows: SmC_A^*-SmC_α^*-SmA-Iso. Transition temperatures except for that of SmA-Iso. transition decrease with increasing the concentration of DANS. On the other hand, the phase sequence is independent of the concentration of benzoic acid up to 10Wt%. The difference between them suggests that the inserted positions of doped molecules differ in these two cases (DANS, benzoic acid).
