The cobaltite Ba 2 CoO 4 presents a monoclinic symmetry (space group P 2 1 /n ) and lattice parameters a = 5.891 31(7), b = 7.59 74(3), c = 10.3638(2) Å, and β = 91.90(1)°. As determined from X-ray and neutron diffraction data, its structure can be described as formed by isolated CoO 4 tetrahedra defining zigzag rows running along the a axis, separated by Ba atoms in both the b and the c directions. The cobalt atoms are in a high spin Co 4+ ground state, and their magnetic structure evidences the existence of antiferromagnetic and ferromagnetic alignments of the magnetic moments alternating along each of the aforementioned rows. Transport properties are related to p-type carriers.
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Boulahya et al. (2006) studied this question.
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