Tuning Co valence state in cobalt oxyhydrate superconductor by post reduction

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We report a successful tuning of Co valence state in cobalt oxyhydrate superconductor via a facile post reduction using NaOH as reducing agent. The change in Co valence was precisely determined by measuring the volume of the released oxygen. The possible hydronium-incorporation was greatly suppressed in concentrated NaOH solution, making the absolute Co valence determinable. As a result, an updated superconducting phase diagram was obtained, which shows that the superconducting transition temperature increases monotonically with increasing Co valence in a narrow range from +3.58 to +3.65.
17 pages, 5 figures and 1 table. Chem. Mat. in press

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Superconductivity, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/139274

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0708.3529
 http://arxiv.org/abs/0708.3529
 Chem. Mater. 2007, 19, 4432-4435
 doi:10.1021/cm0702262

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arXiv