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

✍ Scribed by Anja Olafsen; Helmer Fjellvåg; Bjørn C. Hauback

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
304 KB
Volume
151
Category
Article
ISSN
0022-4596

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✦ Synopsis

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 3n؉1 . Rietveld-type analyses of high-resolution powder synchrotron X-ray and powder neutron di4raction (PND) data of Nd 4 Co 3 O 10؉ and Nd 4 Ni 3 O 10؊ reveal their crystal structures to be slightly monoclinically distorted. The symmetry lowering to space group P2 1 /a is caused by tilting of the MO 6 octahedra within the (NdMO 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 longrange 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؉ in atmospheres of oxygen and nitrogen shows a complex behavior, with respect to both possible phase transitions and redox properties.

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