TRARI, Mohamed; TÖPFER, Jörg; DORDOR, Patrice; GRENIER, Jean-Claude; POUCHARD, Michel; DOUMERC, Jean-Pierre

doi:10.1016/j.jssc.2005.06.009

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TRARI, Mohamed
Laboratoire de Stockage et de Valorisation des Energies Renouvelables

TÖPFER, Jörg
Department of SciTec

DORDOR, Patrice
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Solid State Chemistry. 2005, vol. 178, n° 9, p. 2751-2758

Elsevier

Résumé en anglais

Solid solutions of formula Cu1+xMn1−xO2 (0 < x < 0.2) were synthesized by solid state reaction in silica sealed tubes. They crystallize with the monoclinic crednerite structure (space group C2/m). The stability domain in air is quite narrow and a phase diagram is proposed and compared with previous results. Magnetic study confirmed the HS state of Mn3+ ions and revealed that the predominant interactions are antiferromagnetic. Their strength decreases with x, which can be ascribed to a dilution effect, and long-range 3D magnetic ordering observed for CuMnO2, disappears for x> 0.05. The crednerite solid solutions are p-type semiconductors. Modeling the thermoelectric power behavior suggests that charge carriers are Cu2+ holes diffusing in Cu layers for small x values and Mn4+ holes diffusing in Mn layers for x>0.05. For larger x values a saturation effect limits the charge carrier concentration.< Réduire

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Crednerite

Magnetic properties

Thermoelectric power

Jahn–Teller effect

Manganese oxides

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Preparation and physical properties of the solid solutions Cu1+xMn1-xO2 (0 < x < 0.2)

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