Structural and Magnetic Properties of Transition Metal Arsenates, AAs2O6, A = Mn, Co, and Ni

The divalent transition metal arsenates with the general formula A As2O6, where A is Mn, Co, Ni, were prepared. Their crystal structures were refined using the Rietveld profile method with neutron powder diffraction data in the space group P -31m. NiAs2O6 has the unit cell dimensions (Å) a = 4.7585(7), c = 4.4349(4), Z = 1, and V = 86.97 Å3; for CoAs2O6, a = 4.7768(12), c = 4.4968(8), and V = 88.09 Å3; and for MnAs2O6a = 4.7956(9), c = …