Crystal and Magnetic structure determination on the (NH4)2[MoCl5(H2O)] compound
The A2[FeX5(H2O)] erythrosiderite-type compounds, where A stands for an alkali metal or ammonium ion and X for a halide ion, have recently awakened interest due to the occurrence of multiferroicity or magnetoelectricity. We have recently investigated by means of single crystal neutron diffraction the influence on the nuclear and magnetic structures of the chemical substitution in the A-site. The influence on the macroscopic behavior has been studied on two of these compounds, (ND4)2[FeCl5(D2O)] and (Cs)2[FeCl5(D2O)]. In the current work, we want to study the nuclear and magnetic structure when the Fe(III) is replaced by Mo(III), with very similar properties but with differnt spin. The crystal structure at RT was solved on the orthorhombic space group Pnma. At low temperature the specific heat shows a clear lambda peak at 7.8 K, which is related with the occurrence of long range magnetic order. Moreover the magnetic structure changes with magnetic fields above 3 T, due to a possible spin-flip transition. In order to elucidate the nuclear and magnetic structure, at zero and under magnetic-field, we kindly apply to 15 days of beam time on D9 single crystal neutron diffractometer.
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J Campo; FABELO ROSA Oscar Ramon; Miguel Pardo-Sainz and RODRIGUEZ VELAMAZAN Jose Alberto. (2019). Crystal and Magnetic structure determination on the (NH4)2[MoCl5(H2O)] compound. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1019
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