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Abstract
The influence of the optical purity on the phase sequence of an antiferroelectric liquid crystal, MHPOBC, under pressure was studied by dielectric and switching current measurements. In the case of R: S = 75:25, the phase sequence is independent of pressure up to 150 MPa. As the pressure is increased, the temperature width of the ferroelectric SmC* phase widens slightly but that of the antiferroelectric SmC A * phase narrows a little. On the other hand, the ferroelectric SmC* phase in the case of R: S = 100:0 disappears at 100 MPa. The ferrielectric SmCγ* phase don't disappear and the temperature width of the phase widens. On the basis of the results under pressure, we discuss the strengths of the ferroelectric and antiferroelectric orderings in MHPOBC with different optical purities.