Preparation and physical properties of the solid solutions Cu1+xMn1-xO2 (0 < x < 0.2) - Archive ouverte HAL Access content directly
Journal Articles Journal of Solid State Chemistry Year : 2005

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

Abstract

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.

Dates and versions

hal-00096036 , version 1 (18-09-2006)

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Cite

Mohamed Trari, Jörg Töpfer, Patrice Dordor, Jean-Claude Grenier, Michel Pouchard, et al.. Preparation and physical properties of the solid solutions Cu1+xMn1-xO2 (0 < x < 0.2). Journal of Solid State Chemistry, 2005, 178 (9), pp.2751-2758. ⟨10.1016/j.jssc.2005.06.009⟩. ⟨hal-00096036⟩

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