The crystal and magnetic structures of the lanthanum cobaltites Lao.6Sro.4CoO 3, Lao.(,Sro.,~Coo.~Feo.~O 3 and Lao.6Bao.4Coo.gFeo.~O~ have been studied by neutron powder diffraction at temperatures of 2, 300 and 90(1 K. All compounds undergo a phase transition from cubic to rhombohedral structure. Below the room temperature La~.~,Sro.,~CoO 3 becomes ferromagnetic while for the components with 10% Fe substituted for Co, we found an antiferromagnetic order.

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