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Experimental investigation of structure - property relationships and dimensionality aspects in some cobalt and vanadium oxides

Abstract : Lamellar cobalt double oxides and vanadium oxides have recently attracted tremendous interestafter the discovery of their interesting thermoelectric properties. Our efforts aimed at synthesizingnovel related compounds using standard solid state, ion exchange and/or hydrothermaltechniques. In order to modulate and optimize their thermoelectric characteristics, we have tunedthe composition of cobalt double oxides by appropriate substitutions. In quasi 1D vanadiumoxides, the interplay between spin, charge and orbital degrees of freedom often leads toremarkable properties. Here we dealt with three different polymorphs of vanadium dioxide,namely M1, A and B. We explored the several novel systems by constructing systematic phasediagrams. We also studied the effect of Mo and Cr:V substitution on the stability of thesepolymorphs and characterized their electronic properties in relation with the structural phasetransition mechanisms. Finally, we explored their potentiality for thermoelectric applications.
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Srinivasa Rao Popuri. Experimental investigation of structure - property relationships and dimensionality aspects in some cobalt and vanadium oxides. Other. Université Sciences et Technologies - Bordeaux I, 2012. English. ⟨NNT : 2012BOR14665⟩. ⟨tel-00927123⟩

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