Magnetic behaviour of bimetallic layered phases M'0.2Mn0.8PS3·0.25 H2O (M' = ZnII, CuII, NiII, CoII)

Manganese(ii) thiophosphate (MnPS3) intercalates with lanthanide (PrIII and NdIII) complexes: optical and magnetic properties

We report the intercalation of PrIII and NdIII macrocyclic complexes into the layered hexahypothiophosphate MnPS3 and the effect of this process on the optical and magnetic properties of the layered host.

Influence of the NiII/MnII ratio on the physical properties of heterometallic Ni2xMn(2−2x)P2S6 phases and potassium intercalates K0.8Ni2xMn(1.6−2x)P2S6·2H2O

Physical properties of bimetallic Ni^II/Mn^II phases obtained by microwave assisted reaction.

Physical properties of new ordered bimetallic phases M0.25Cd0.75PS3 (M = ZnII, NiII, CoII, MnII)

Four bimetallic phases of the thiophosphate family have been synthesized by the cationic exchange reaction using a freshly prepared K0.5Cd0.75PS3 precursor phase and methanolic solutions of nitrates of the divalent cations ZnII, NiII, CoII, and MnII. All the materials were characterized by FTIR, PXRD, SEM-EDXS and (in the case of the diamagnetic compounds) by solid state NMR. For the K0.5Cd0.75PS3 precursor, the X-ray powder diffraction data suggest a modification of the structure, while solid state NMR results confirm that this phase possesses an ordered arrangement of Cd vacancies. The cationic exchange reaction achieves a complete removal of potassium ions (no potassium detected by SEM-EDXS) and re-occupation of the vacancies by divalent cations. Therefore, the obtained compounds have an average composition of M0.25Cd0.75PS3 (M = ZnII, NiII, CoII, MnII) and possess an ordered distribution of the substituent cations. Even with the paramagnetic substitution level of 25%, antiferromagnetic behaviour is present in the phases with MnII, CoII and NiII, as evidenced by dc susceptibility and in the case of the MnII substituted phase by EPR. The cooperative magnetic interactions confirm the conclusion that the paramagnetic ions adopt an ordered arrangement. The analysis by broad band impedance spectroscopy allows to attribute the conductivity in these materials to charge movements in the layers due to the difference in electronegativity of the metal ions. Zn0.25Cd0.75PS3 is the phase that shows the highest conductivity values. Finally, the band gap energies of the bimetallic phases tend to be lower than those of the single-metal phases, probably due to an overlap of the band structures.