The [SrM(C 3 H 2 O 4 ) 2 (H 2 O) 7 ] (M = Mn, Fe, Co, Ni) compounds compound (-24.5 K) where the decrease of the χ m T curve can also be attributed to the spin-orbit coupling. Thermal have been prepared and characterised by chemical analysis and X-ray diffraction. The crystal structure of analyses performed in air and under nitrogen show three consecutive steps: dehydration, ligand pyrolysis, and ), b = 14.360(2), c = 15.800(2) A ˚. β = inorganic residue evolution. Thermal treatments in tubular furnaces were performed in order to obtain pure SrMO 3-x 101.69(1)°]. The compound exhibits a three-dimensional chain/snake structure consisting of -CoO 6 -[SrO 7 ] ϱ -CoO 6 -phases. In all cases the oxides are nonstoichiometric and oxygen-deficient with structures related to that of perovskite. repeating units parallel to the [0 1 1] and [0 -1 1] directions. UV/Vis data are consistent with the cations being in a high-Lower temperatures and reaction times than those given in the literature have been used when using the ceramic spin octahedral symmetry. Magnetic measurements show antiferromagnetic interactions for all compounds with method. These "soft" treatments gave rise to homogeneous particles of small grain size. approximate θ values of -0.5 K, except for the cobalt
In addition to the oxidation state, the physical properties