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Structure and electrical properties of single-phase cobalt manganese oxide spinels Mn3xCoxO4 sintered classically and by spark plasma sintering(SPS)

Bordeneuve, Hélène and Guillemet-Fritsch, Sophie and Rousset, Abel and Schuurman, Sophie and Poulain, Véronique Structure and electrical properties of single-phase cobalt manganese oxide spinels Mn3xCoxO4 sintered classically and by spark plasma sintering(SPS). (2009) Journal of Solid State Chemistry, vol. 182 (n° 2). pp. 396-401. ISSN 0022-4596

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Official URL: http://dx.doi.org/10.1016/j.jssc.2008.11.004

Abstract

Cobalt manganeseoxidespinelsMn3xCoxO4 (with 0.98pxp3) werepreparedbythethermal decompositioninairofoxalateprecursors.Theinfluenceofthethermaltreatmentsonthestructure of thesematerialsisemphasized.Single-phaseceramicswereobtainedafteroptimizationofthe sintering parameters.AprecisephasediagramfortheCo–Mn–Osystemisproposedaccordingto thermalstabilityandstructureofoxidepowders.Theelectricalmeasurementsonsingle-phaseceramics show thatlowvaluesofresistivitycanbeachieved.Theconductioncouldtakeplacethroughjumpsof polarons betweenMn3+ and Mn4+ on octahedralsites.Thesecompoundspresentinterestingelectrical characteristics fornegativetemperaturecoefficient(NTC)thermistorapplications.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Solid State Chemistry website : http://www.sciencedirect.com/science/journal/00224596
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
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Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Nihad Lahdifi

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