Crystal Structure and Properties of Nd4Co3O10+δ and Nd4Ni3O10−δ

Abstract The crystal structures of Nd 4 M 3 O 10 ( M =Co, Ni) correspond to the n =3 members of the Ruddlesden–Popper series of A n +1 B n O 3 n +1 . Rietveld-type analyses of high-resolution powder synchrotron X-ray and powder neutron diffraction (PND) data of Nd 4 Co 3 O 10+ δ and Nd 4 Ni 3 O 10− δ reveal their crystal structures to be slightly monoclinically distorted. The symmetry lowering to space group P 2 1 / a is caused by tilting of the M O 6 octahedra within the (Nd M O 3 ) 3 layers. Long apical M –O distances are observed in the octahedra pointing toward the NdO layers. Magnetic susceptibility data for Nd 4 Co 3 O 10.00 indicate long-range antiferromagnetic ordering below 15 K. The ordered moment is too low to be detected by PND at 8 K. Above 60 K, two nearly Curie–Weiss paramagnetic regions are observed: 60–560 K and 650–920 K. Thermal analysis data for Nd 4 Co 3 O 10+ δ in atmospheres of oxygen and nitrogen shows a complex behavior, with respect to both possible phase transitions and redox properties.

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