An antiferroelectric liquid crystal substance represented by the following general formula (1) <IMAGE> (1) wherein R represents a straight-chain alkyl group of 6-10 carbon atoms; X represents <IMAGE> when X is <IMAGE> Y is any of CH3, CF3 and C2H5, L is 0 or an integer of 5 to 8, m is 0 or 1, and n is an integer of 1 to 10; when X is when Y is CH3, L is 0 or an integer of 5 to 8, m is 0 or 1, and n is an integer of 1 to 10, (2) when Y is CF3, L is an integer of 5 to 8, m is 1, and n is an integer of 1 to 10 and (3) when Y is C2H5, L is 0, m is 0, and n is an integer of 4-10.
Dioxane type liquid crystal substance