Electroclinic coefficients (ec) and reduced polarizations (Po) were measured in the SmA* and SmC* liquid crystal phases formed by 4 mol% mixtures of the chiral dopant (–)-2,2′,6,6′-tetramethyl-3,3′-dinitro-4,4′-bis[(4-nonyloxybenzoyl)oxy]biphenyl [(–)-1] in the binary host mixture of 5-(4-butyloxyphenyl)-2-octyloxypyrimidine (5-PhP1) and 2-(4-butyloxyphenyl)-5-octyloxypyrimidine (2-PhP1) over the mole fraction range 0 ≤
x5-PhP1
≤ 0.24. Both ec and Po increase with x5-PhP1, which is consistent with the assumption that 5-PhP1 should be more effective in propagating chiral perturbations exerted by (–)-1. At x5-PhP1
= 0.24 and T
−
TC
=
+5 K, the electroclinic coefficient is 0.34°
µm V−1, which is one order of magnitude greater than the highest ec value previously reported for a chiral dopant at the same mole fraction and reduced temperature.
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