Abstract: An antiferroelectric mixture comprising first and second components is provided, the mixing proportions of the first and second components being 60-97 wt. % and 3-40 wt. % based upon the total weight of the two components, respectively, the first component being selected from the group consisting of compounds expressed by the formula (I) and the second component being selected from the group consisting of compounds expressed by the formula (II): ##STR1## wherein R.sup.1 and R.sup.3 are C.sub.1-18 alkyl or alkoxy, R.sup.2 and R.sup.4 are C.sub.2-18 alkyl or alkoxy, X and Y are --CH.sub.3, --CF.sub.3 or --C.sub.2 F.sub.5, rings A, B, C, D and E are 1,4-cyclohexylene, 1,4-phenylene an H atom of which may be replaced by a halogen atom or a cyano group, pyridine-2,5-diyl, pyrimidine-2,5-diyl, pyrazine-2,5-diyl or pyridazine-3,6-diyl, Z is --COO--, --CH.sub.2 O-- or --OCH.sub.2 --, m and n each are 1 or 2, (m+n) is 3, and Z is 0 or 1.