High-temperature electrical and thermal transport behaviors of In2O3-based ceramics by Zn-Sn co-substitution

Abstract

We report remarkably the enhanced thermoelectric performance of Sn-Zn co-doped In2O3 that were synthesized by a solid-state reaction followed by spark plasma sintering in the mid-temperature range. The X-ray diffraction study indicates that Sn and Zn were successfully co-substituted at the In site without forming any additional phase even at 8% doping concentration. The co-substitution shows a significant increase in the electrical conductivity by band structure modification resulting in a significantly enhanced power factor. The point defect engineering combined with nanostructuring using a high energy ball milling suppressed the lattice thermal conductivity, which eventually resulted in an increased ZT value of 0.32 at 973 K, that is, about 7 times higher than that of pure In2O3. Thus, this study demonstrates the important role of co-substitution in improving the thermoelectric properties of n-type oxides.

Review on texturization effects in thermoelectric oxides

“…14 are-In-Sn-O [129], (Ca, Bi)MnO 3 [130], (Ca,In)MnO 3 [131], (Zn, Al)O [86], (Zn, Al)O nanovoid [88,132], (Zn, Al, Ga)O [89], (Ca, Eu) 3 Co 4 O 9 [45], (Ca, Ho) 3 Co 4 O 9 [133], (Ca, Lu) 3 Co 4 O 9 [46], CaMn 1−x Nb x O [134], Ca 3 (Co, Ga) 4 O 9 [47], (Ca, Ag) 3 Co 4 O 9 /Ag [49], (Ca, Ag, Lu) 3 Co 4 O 9 [58], Na(Co,Cu) 2 O 4 [67], Na(Co,Zn) 2 O 4 [135], NaCo 2 O 4 [136], Bi 2 Sr 2 Co 2 O y [137], (Sr,Dy)TiO 3 [23], Ca(Mn,Nb)O [134], (In,Zn,Ge)O [138], (Zn,Al)O [90], PPP/(Zn.Ni)O [139], (Zn. In)O [140], TiC 0.1 O 0.9 @TiO y -TiO 2 [141], In(Zn,Sn)O [142], BiCu0.90SeO [143], (Bi,Sr)CuSeO [117], (Bi,Ba)CuSeO [112], (Bi,Na)CuSeO [144], (Bi,Pb)CuSeO [144], (Bi,Ba) CuSeO [112], (Bi,Pb)CuSeO [145], Modulation BiCuSeO [118], (Bi,Ba)CuSeO [146], and (Bi,Ca,Pb)CuSeO [119].…”

Thermoelectric Performance Enhancement of Vanadium Doped n-Type In2O3 Ceramics via Carrier Engineering and Phonon Suppression

“…The details of synthesis methods can be found elsewhere. 16 Compact powder was obtained via SPS at 1223 K. The mass density ρ is determined by the Archimedes method and is illustrated in Table 1. X-ray diffraction and field emission SEM were employed to analyze phase composition and morphology of synthesized samples, respectively.…”

“…High-quality polycrystalline ingots belong to the series In 2– x V x O 3 ( x = 0, 0.04, 0.08, 0.12, 0.16) were fabricated by the solid-state reaction method. The details of synthesis methods can be found elsewhere . Compact powder was obtained via SPS at 1223 K. The mass density ρ is determined by the Archimedes method and is illustrated in Table .…”

Electrical Property Enhancement in Orientation‐Modulated Perovskite La‐Doped SrTiO3 Thermoelectric Thin Films

“…Due to the high-temperature endurance, chemical stability, non-toxicity, and abundance in earth, oxides are irreplaceable as thermoelectrics. [13][14][15][16][17] In n-type thermoelectrics, there were researches on ZnO, [18][19][20][21][22][23] CdO, [24] TiO 2 , [25,26] In 2 O 3 [27][28][29] -based simple oxides, and Bi 2 O 2 Se, [30,31] Bi 2 LnO 4 Cu 2 Se 2 , [32] Sr 2 MO 2 Cu 2 Se 2 (M = Co, Ni, Zn) [33] -based layered oxides, while the simple crystal structure providing few elemental sites to be tuned, and low symmetry of layered oxides resulting in low electron effective mass, [34][35][36][37][38] limited the enhancement of their electrical properties. Strontium Titanate (SrTiO 3 ) as a cubic phase perovskite oxide possesses high symmetry and high density of states near the conduction band minimum (CBM), thus having a relatively large density of states effective mass and outperforming power factors.…”