An electric field-temperature (E-T) phase diagram has been drawn for several binary mixtures of antiferroelectric liquid crystals using conoscopic observation. All the possible phases are SmA-SmCα
*-SmC*-new antiferroelectric phase-new ferrielectric phase-SmCγ
*-new ferrielectric phase-SmCA
*, some of which appear in the above regular order. Two Devil's staircases are necessary to elucidate systematic understanding of successive phase transitions among ferroelectric, ferrielectric and antiferroelectric phases: one is a staircase of SmCα
*(q
T) already discussed by Takanishi et al. and the other is a staircase of SmCA
*(q
T). Competition between an antiferroelectric interaction responsible for SmCA
* and a ferroelectric one for SmC* is considered to stabilize a variety of phases, SmCA
*(q
T).
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