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Article Dans Une Revue Journal of Applied Physics Année : 2014

Tailoring of crystal phase and Néel temperature of cobalt monoxides nanocrystals with synthetic approach conditions

Résumé

Cobalt monoxide (CoO) nanocrystals were synthesized by thermal decomposition of cobalt oleate precursor in a high boiling point organic solvent 1-octadecene. The X-ray diffraction pattern and transmission electron microscopy studies suggest that pure face-centered-cubic (fcc) phase of CoO can be synthesized in the temperature range of 569–575 K. Thermolysis product at higher synthesis temperature 585 K is a mixture of fcc and hexagonal-closed-packed (hcp) phases. These nanocrystals are single crystals of CoO and exhibit mixture of two types of morphologies; one is nearly spherical with 5–25 nm diameter, and other one is 5–10 nm thick flake. The pure fcc-CoO nanocrystals show enhanced, and mixture of fcc- and hcp-CoO nanocrystals show reduced antiferromagnetic ordering temperature. Such results provide new opportunities for optimizing and enhancing the properties and performance of cobalt oxide nanomaterials.

Dates et versions

hal-02118527 , version 1 (03-05-2019)

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Citer

A. Ravindra, B. Behera, P. Padhan, O. Lebedev, Wilfrid Prellier. Tailoring of crystal phase and Néel temperature of cobalt monoxides nanocrystals with synthetic approach conditions. Journal of Applied Physics, 2014, 116 (3), pp.033912. ⟨10.1063/1.4890512⟩. ⟨hal-02118527⟩
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