Deuteron substitution effects on crystallization in N, N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium tetrafluoroborate-water mixtures

► By D2O substitution, amorphization in the [DEME][BF4]-6.7 mol% H2O was suppressed completely. ►Crystallization temperature has the minimum value as a crossover point. ► The enthalpy difference at the crossover point suggests the anomalous mixing state.