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Abstract
During the synthesis by flux evaporation in KC1 at 930°C of KCrIIPO4 an oxidation of chromium II was observed, leading to the formation of chromium pyrophophate KCrIIIP2O7. The crystal lattice of KCrIIIP2O7, was found to be of monoclinic centrosymmetric space group P21/c with a=7.3470(7), b=9.9090(10), c=8.1730(8)Å, β=106.806(11)°, Z=4 and VM =569.59(10)Å3. The magnetic susceptibility has been measured between 3.6 and 300K at different magnetic field strengths. The negative value of the Curie-Weiss temperature and the behaviour of magnetic susceptibility indicate an antiferromagnetic spin order in this compound with a Néel temperature TN =8.5 K.
