Thermoelectric and Magnetic Properties of Bi0.5Na0.5TiO3-Doped NaxCoO2 Ceramics

Buntham, Suwapitcha; Keawprak, Nittaya; Watcharapasorn, Anucha

doi:10.1166/jnn.2017.14101

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“…Doping Ru and Mn in Na 0.5 CoO 2 , however, increased the resistivity to ~ 300 µΩ m, three times higher than that of the undoped Na 0.5 CoO 2 [19]. Similarly, co-doping Ti and Bi almost halved the Seebeck coefficient in Na 0.6 CoO 2 to ~ 60 μK/V [20].…”

Section: Introductionmentioning

confidence: 93%

Suppression of magnetism and Seebeck effect in Na0.875CoO2 induced by SbCo dopants

Assadi

Mele

Fronzi

2020

Mater Renew Sustain Energy

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We examined the electronic property of Sb-doped Na 0.785 CoO 2 using density functional calculations based on GGA+U formalism. We demonstrated that Sb dopants were the most stable when replacing Co ions within the complex Na 0.875 CoO 2 lattice structure. We also showed that the Sb Co dopants adopted the + 5 oxidation state introducing two electrons into the host Na 0.875 CoO 2 compound. The newly introduced electrons recombined with holes that were borne on Co 4+ sites that had been created by sodium vacancies. The elimination of Co 4+ species, in turn, rendered Na 0.875 (Co 0.9375 Sb 0.0625)O 2 nonmagnetic and diminished the compound's thermoelectric effect. Furthermore, the Sb Co dopants tended to aggregate with the Na vacancies keeping a minimum distance. The conclusions drawn here can be generalised to other highly oxidised dopants in Na x CoO 2 that replace a Co.

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Section: Introductionmentioning

confidence: 93%