Abstract:In this study, we demonstrate that
introduction of rare-earth elements,
R = La or Pr, into the Bi–O charge reservoir layer of BiCuSeO
leads to an increase of both the charge carrier concentration and
the effective mass. Although the charge carrier mobility slightly
decreases upon Bi3+ to R3+ substitution, the
electronic transport properties are significantly improved in a broad
temperature range from 100 to 800 K. In particular, the electrical
resistivity decreases by 2 times, while the Seebeck coefficient dro… Show more
“…Compounds with the nominal chemical compositions of Bi 1− x Pb x Cu 1− x SeO ( x = 0, 0.02, 0.06, and 0.08) were synthesized as reported elsewhere 16 using high purity CuO, Bi, Se, and PbO powders as the raw materials. The obtained products were consolidated through spark plasma sintering (SPS) at 903 K for 5 min under an axial pressure of 50 MPa.…”
Simultaneous Bi to Pb substitution and Cu vacancies enhance power factor, increasing zT. Lattice thermal conductivity, crucial for zTmax, is greatly influenced by synthesis method.
“…Compounds with the nominal chemical compositions of Bi 1− x Pb x Cu 1− x SeO ( x = 0, 0.02, 0.06, and 0.08) were synthesized as reported elsewhere 16 using high purity CuO, Bi, Se, and PbO powders as the raw materials. The obtained products were consolidated through spark plasma sintering (SPS) at 903 K for 5 min under an axial pressure of 50 MPa.…”
Simultaneous Bi to Pb substitution and Cu vacancies enhance power factor, increasing zT. Lattice thermal conductivity, crucial for zTmax, is greatly influenced by synthesis method.
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