Abstract: Magnetic ionic liquids (MILs) are molten salts formed entirely of ions, which have a melting point below 100 ºC. The great variety of possible combinations of anions and cations makes them a huge potential field of development of smart materials with a primary focus in Materials Science. Actually, we are studying the influence of the organic group in the magnetic interaction mechanisms of MILs based on imidazolium tetrahalureferrates family. Specifically, the dependence of the Neel temperature (TN) as a function of the size of the radicals of the imidazolium cation. We have synthetized other two members of this family with a three-dimensional magnetic ordering because the trend is not clear. We have performed a preliminary investigation of the thermal properties (by differential scanning calorimetry) and the crystal and magnetic structure (by neutron powder diffraction) of TriminFeX4. Therefore, in this proposal we ask for 2 days at D2B high resolution diffraction instrument to obtain accurate magnetic structure characterization and phase transitions

Experiment Parameters Experiment energy 1.594 Sample Parameters Formula 1,2,3 trimethyl imidazolium tetrahaloferrate TrimimFeX4 (X = Cl and Br)

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