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Issue 0, 1974
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Spin state equilibria and localized versus collective d-electron behaviour in neodymium and gadolinium trioxocobaltate(III)

Abstract

Magnetic susceptibility measurements and Mössbauer spectra show that NdCoO3 and GdCoO3 contain predominantly low-spin CoIII ions at low temperatures which transform partially to high-spin Co3+ until a certain temperature. Beyond this temperature, there is a transfer of eg electrons from Co3+ to CoIII giving rise to di- and tetra-valent Co species followed by short-range ordering. Co3+ ions completely disappear at about 1000 K where there is a gradual transition from localized electron behaviour to collective behaviour. The cobaltates are semi-metals beyond this transition. The spin state equilibria and the electronic transition described here find support from electron transport properties, Mössbauer parameters as well as differential thermal analysis and X-ray data.

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J. Chem. Soc., Faraday Trans. 2, 1974,70, 512-523
Article type
Paper

Spin state equilibria and localized versus collective d-electron behaviour in neodymium and gadolinium trioxocobaltate(III)

D. S. Rajoria, V. G. Bhide, G. R. Rao and C. N. R. Rao, J. Chem. Soc., Faraday Trans. 2, 1974, 70, 512
DOI: 10.1039/F29747000512

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