Preparation and physical properties of the solid solutions Cu{sub 1+x}Mn{sub 1-x}O{sub 2} (0=<x=<0.2)

Journal Article · Thu Sep 15 00:00:00 EDT 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.06.009· OSTI ID:20729082

Trari, M ^[1]; Toepfer, J ^[2]; Dordor, P ^[3]; Grenier, J C ^[3]; Pouchard, M ^[3]; Doumerc, J P ^[3]

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1. Laboratoire de Stockage et de Valorisation des Energies Renouvelables, USTHB BP 32, El-Alia Algiers 16111 Algeria (Algeria)
2. Fachhochschule Jena, FB SciTec Carl-Zeiss-Promenade 2, 07745 Jena (Germany)
3. Institut de la Matiere Condensee de Bordeaux, ICMCB-CNRS, 87, avenue du Dr. Schweitzer, 33608 Pessac, Cedex (France)

Solid solutions of formula Cu{sub 1+x}Mn{sub 1-x}O{sub 2} (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 Mn{sup 3+} 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 CuMnO{sub 2}, disappears for x> 0.05. The crednerite solid solutions are p-type semiconductors. Modeling the thermoelectric power behavior suggests that charge carriers are Cu{sup 2+} holes diffusing in Cu layers for small x values and Mn{sup 4+} holes diffusing in Mn layers for x>0.05. For larger x values a saturation effect limits the charge carrier concentration.

• OSTI ID: 20729082
• Journal Information: Journal of Solid State Chemistry, Vol. 178, Issue 9; Other Information: DOI: 10.1016/j.jssc.2005.06.009; PII: S0022-4596(05)00272-0; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
CHARGE CARRIERS
COPPER IONS
HOLES
INTERACTIONS
JAHN-TELLER EFFECT
LAYERS
MAGNETIC PROPERTIES
MANGANESE IONS
MANGANESE OXIDES
MONOCLINIC LATTICES
PHASE DIAGRAMS
SEMICONDUCTOR MATERIALS
SILICA
SIMULATION
SOLID SOLUTIONS
SPACE GROUPS