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Synthesis and Crystal Structure of the Vacancy-Ordered LaNi1−xMxO2.5+δ(M=Mn, Fe, Co) Phase

✍ Scribed by Siv Aasland; Helmer Fjellvåg; Bjørn C Hauback

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
365 KB
Volume
135
Category
Article
ISSN
0022-4596

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✦ Synopsis

The synthesis and crystal structure of a new type of oxygendeficient compound with the formula LaNi 19x M x O 2.5; (M:Mn, Fe, Co) are reported. The new phases crystallize in a tetragonal cell with dimensions a T :2(2 a C and c T :a C , where a C means the cell parameter of an ideal cubic perovskite. The structure was refined in space group P4/m (Z:8), with deficiency of four oxygen atoms per unit cell, i.e., La 8 (Ni 19x M x ) 8 O 20 , compared to the ideal perovskite. The crystal structure and the ordering of the oxygen vacancies were determined by synchrotron powder X-ray and neutron powder diffraction. The structure is built of corner-sharing NiO 6 octahedra, NiO 5 pyramids, and NiO 4 square-planar groups with La 3; occupying ten-coordinated voids.

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