A study of Co3-xNixO4(O ≤x ≤ 1) system

Appandairajan, N. K. ; Gopalakrishnan, J. (1978) A study of Co3-xNixO4(O ≤x ≤ 1) system Proceedings of the Indian Academy of Sciences - Chemical Sciences, 87 (4). pp. 115-120. ISSN 0253-4134

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Official URL: http://www.ias.ac.in/j_archive/chemsci/87/3/115-12...


A series of solid solutions of composition Co3-xNixO4 has been studied. For 0 ≤ x ≤ 1·1 the members crystallize in the cubic spinel structure Measurements of dc electrical conductivity and Seebeck coefficient show that there is a transition from semiconducting state to semi-metallic state around x=0·5-0·6. All compositions withx>0.5 are semimetallic and ferrimagnetic. The results have been rationalised on the basis of the cation distribution (Co2+)t [NixIIICo2-xIII]0O4 for the solid solutions which permits formation of σ*(eg) band through strong covalent interaction between octahedral-site low spin CoIII/NiIII and oxide ion in the spinel structure.

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