Electronic and spin configurations of Co3+ and Ni3+ ions in oxides of K2NiF4 structure: a magnetic susceptibility study

Mohan Ram, R. A. ; Singh, K. K. ; Madhuaudan, W. H. ; Ganguly, P. ; Rao, C. N. R. (1983) Electronic and spin configurations of Co3+ and Ni3+ ions in oxides of K2NiF4 structure: a magnetic susceptibility study Materials Research Bulletin, 18 (6). pp. 703-712. ISSN 0025-5408

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002554...

Related URL: http://dx.doi.org/10.1016/0025-5408(83)90097-1

Abstract

In La4LiCoO8, Li+ and Co3+ ions are ordered in two dimensions and Co3+ ions undergo transitions from the low-spin to the intermediate as well as the high-spin states. Both Sr4TaCoO8 and Sr4NbCoO8 exhibit low to intermediate-spin state transitions of Co3+ ions. In the system LaSr1−xBaxNiO4, the eg electrons are essentially in extended states forming a σx2−y2 band. With increase in x, the band width decreases accompanying an increase in unit cell volume; high-spin Ni3+ ions are formed to a small extent with increasing x, but there is no spin-state transition. In LaSrAl1−xNixO4, at small x, there is a small proportion of high-spin Ni3+; when x≈0.6, there is an abrupt decrease in the c̲/a̲ ratio, signalling the formation of the σx2−y2 band. In LnSrNiO4, the c̲/a̲ ratio decreases sharply between Ln=La and Nd; this is likely to be accompanied by a broadening of the σx2−y2 band.

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