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C250 pressure-cell was loaded into a helium flow cryostate. Analysis of the recorded data shows that Fe1.087Te is tetragonal with space group P4/nmm at 80 K and ≈0.45 GPa. A commensurate antiferromagnetic monoclinic phase with propagation vector k = (1⁄2 0 1⁄2) was observed at ≈2K and 0.44 GPa. The magnetic moments of iron of 1.74(7) BM were found to be parallel with the b-axis. The magnetic structure observed at ≈2K and 0.44 GPa is closely related to the magnetic structure observed at ambient pressure and T < 63 K but with a reduced magnetic moment of iron [1]. The tetragonal P4/nmm structure was preserved at a pressure of 1.15 GPa and 80 K. Cooling at this pressure revealed the existence of a new magnetic phase between ≈60 and ≈48 K. The analysis of data recorded at 55 K shows that the magnetic phase is incommensurate with propagation vector k = (0.445 0 1⁄2), while the chemical structure was found to be orthorhombic, space group Pmmn. The data could be fitted with both a sinusoidal (magnetic moments parallel to the b-axis) and a cycloidal (magnetic moments rotating in the a,c-plane) model of the magnetic structure. This magnetic phase seems to be stable between 48 and 60 K. This phase corresponds to the HP1 phase observed by Okada et al. by resistivity and magnetization measurements [2]. An incommensurate antiferromagnetic structure with propagation k = (0.495, 0, 0.486) was observed at ≈2K and 1.15 GPa. The observed magnetic structure is closely related to the commensurate antiferromagnetic structure observed at ≈2K and 0.44 GPa but with a sinusoidal modulation with an amplitude of 1.98(8) BM and it develops gradually upon cooling from 48 to 2 K.

Magnetic ionic liquids 1-ethyl- and 1-butyl-3-methylimidazolium tetrachloroferrate(III). Crystallization monitored by powder X-ray thermodiffraction