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- W2949270280 abstract "We reported the structural, electrical, thermal and magnetic properties of Pb-doped Ca3Co4O9 in the range of 300–5 K. DTA analysis showed that the stability of the Ca3Co4O9 was increased with Pb doping. According to XRD analysis, it is found that Pb ions were successfully doped in the Ca3Co4O9 structure. The temperature of resistivity minima, Tmin, increased by increasing the Pb doping level and it is seen that incommensurate spin density wave state becomes more stable with Pb doping. The enhancement of thermopower was explained that Pb doping in Ca sites caused a decrease of Co4+ fraction such that Co4+ ions transformed into Co3+ or Co2+. The room temperature ZT value of the polycrystalline sample reaches about 16 times larger value than that of the un-doped polycrystalline sample which is the promising candidate for high temperatures in the thin film applications. According to magnetic susceptibility measurement, the increase of effective magnetic moment by Pb concentration was explained by spin state transition of Co3+ from low spin to intermediate spin and high spin state together with some orbital angular momentum contribution which comes from 5T2 term due to a decrease of the ligand field splitting energy." @default.
- W2949270280 created "2019-06-27" @default.
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- W2949270280 date "2015-04-01" @default.
- W2949270280 modified "2023-09-26" @default.
- W2949270280 title "An enhancement ZT and spin state transition of Ca3Co4O9 with Pb doping" @default.
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- W2949270280 doi "https://doi.org/10.1016/j.jallcom.2014.11.200" @default.
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