Abstract
A sanderite ferrous sulfate FeSO4·2H2O has been synthesized by the hydro/solvothermal method. Its crystal structure (Pccn, a=6.3160Å, b=7.7550Å, c=8.9880Å, V=440.2Å3, Z=4) can be regarded as the condensation of alternately corner-shared FeO4(H2O)2 octahedra and SO4 tetrahedra with a similar topology of PtS. By structural comparison with the known hydrated ferrous sulfates, the structural relation among them has been noted and discussed in detail. A variable temperature magnetic study shows a spin-canted long-range antiferromagnetic ordering in the low temperature regime, which might result from a possible phase transition during the cooling from the high temperature.
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