Abstract
Dense La0.95Sr0.05Co1-xCrxO3 (0 ≤ x ≤ 0.5) ceramics were synthesized by solid-state reaction and conventional sintering. Room-temperature crystal structure and microstructure were investigated and the thermoelectric properties were measured in the temperature range 323 K–1020 K. La0.95Sr0.05Co1-xCrxO3 is a p-type small polaron conductor. The charge carrier concentration is determined by both substitution of La3+ with Sr2+ and thermally-activated charge disproportionation of Co3+ and /or Cr3+. The variation of electrical conductivity versus Cr content is ascribed to the trapping of p-type polarons at Cr sites. By substituting Co with Cr, the power factor below 800 K is reduced and that above 800 K is improved. The thermal conductivity is effectively reduced by doping Cr. Substitution of Co with Cr greatly enhances the high-temperature (700 K–1000 K) ZT values, reaching 0.04 at 1000 K for La0.95Sr0.05Co0.5Cr0.5O3.
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