Thermoelectric properties of In- and Ga-doped spark plasma sintered ZnO ceramics

Jeong, Ahrong; Suekuni, Koichiro; Ohtaki, Michitaka; Jang, Byung Koog

doi:10.1016/j.ceramint.2021.05.101

Cited by 22 publications

(11 citation statements)

References 41 publications

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“…d) Comparison of power factor extracted from previously reported ZnO‐based TE materials. [ 50–55 ] The temperature dependence of e) thermal conductivity, f) electron thermal conductivity, g) lattice thermal conductivity, and h) ZT for the fabricated ZnO ceramics.…”

Section: Resultsmentioning

confidence: 99%

“…d) Comparison of ZT value extracted from previously reported ZnO‐based TE materials. [ 50–55 ] e) Schematic diagram of the electron and phonon transport mechanisms of 2% nano‐Si 3 N 4 particles compositing the 3% SnO 2 ‐doped ZnO ceramics. f) The Vickers hardness of the typical fabricated ZnO ceramics under a load of 4.9 N and the corresponding microscopy images of indentation.…”

Section: Resultsmentioning

confidence: 99%

“…Besides, the S(T) of all the sample shows negative, suggesting an n-type conductive behavior. Interestingly, after compositing Si 3 N 4 nanoparticles in 3% SnO 2 -doped ZnO, |S| is remarkably enhanced by 57.7% from 67.1 μV•K −1 (sample 3-SnO 2 ) to 105.8 μV•K −1 (sample 2-Si 3 N 4 ) at 300 K coming from the introduced carrier filtering effect that will be discussed in detail later, while 𝜎 is decreased slightly, which may be ascribed to the [50][51][52][53][54][55] The temperature dependence of e) thermal conductivity, f) electron thermal conductivity, g) lattice thermal conductivity, and h) ZT for the fabricated ZnO ceramics.…”

Section: Improved Te Performancementioning

confidence: 95%

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Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Wang,

Gao,

You

et al. 2023

Adv Funct Materials

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ZnO is a promising high‐temperature thermoelectric (TE) material due to its superior stability and earth abundance. However, the coupling relation between Seebeck coefficient and electrical conductivity on carrier concentration limits the optimum TE performance for most TE materials, especially ZnO. Herein, enhancement of TE performance is achieved via a stepwise optimization strategy composed of carrier concentration optimization and carrier filtering effect for fabricating robust ZnO‐based composite ceramics through a self‐developed specific high‐pressure synthesis followed by spark plasma sintering. Specifically, doping SnO2 provide substantial electrons to surge the carrier concentration. The subsequent compositing Si3N4 nanoparticles results in the unique reaction‐generated Zn2SiO4 nanoprecipitates with a larger bandgap and intrinsically low thermal conductivity, which introduce an excellent carrier filtering effect to increase the Seebeck coefficient by 57.7% at 300 K without compromising electrical conductivity much and enhance phonon scattering to cause an ultralow lattice thermal conductivity of 1.39 W m−1 K−1 achieving amorphous limits of ZnO (1.4±0.1 W m−1 K−1). Consequently, a high peak ZT (figure of merit) of 0.691 at 873 K is obtained, which is higher than that of previously reported ZnO‐based TE materials. This work demonstrates a feasible and effective strategy to fabricate high‐performance TE materials, especially those with inferior electrical conductivity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Improved Te Performancementioning

confidence: 95%

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Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Wang,

Gao,

You

et al. 2023

Adv Funct Materials

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“…A temperature higher than 1100 °C was selected for T 1 based on the previous study. 25) For first-step sintering, the samples were heated to 1100 or 1150 °C under a uniaxial pressure of 50 MPa at a high heating rate of 100 °C/min with a holding time of 15 or 5 min, respectively. For second-step sintering, the holding time was varied: 30, 60, and 120 min at 1050 °C.…”

Section: Experiments Procedures 21 Preparation and Consolidation Of Z...mentioning

confidence: 99%

“…The TS-SPS process thus proved a significant advantage for increasing the relative density in comparison with our previous study (91.3 %). 25) The EBSD measurement was carried out with a step size of 0.05 ¯m to analyze the microstructure of the samples. The normal-direction inverse pole figure (IPF) maps are expected to reveal the morphology, size, and orientation of the grains.…”

Section: Microstructural Analysis Of Znomentioning

confidence: 99%

Characterization of ZnO thermoelectric ceramics and their microstructures consolidated by two-step spark plasma sintering

Jeong

Ohtaki

Jang

2022

J. Ceram. Soc. Japan

Self Cite

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Zinc oxide (ZnO) thermoelectric ceramics were consolidated by spark plasma sintering (SPS) along with onestep/two-step sintering (OS/TS) temperature profiles, the latter employing a strategy of heating to a higher temperature (T 1 ) followed by prolonged sintering at a lower temperature (T 2 ) for densification while preventing grain growth. In the first step, the temperatures and holding times were 1100 and 1150 °C for 15 and 5 min, respectively, and the second-step was maintained at 1050 °C for 30, 60, and 120 min. By combining TS and SPS processes (TS-SPS), high relative densities of 91.494.9 % were achieved without significant grain growth. Electron backscatter diffraction (EBSD) revealed a noticeable grain-growth suppression of 56 % for the TS-SPS sample with T 1 = 1100 °C. The highest power factor of 7.8 © 10 ¹5 W K ¹2 m ¹1 was achieved for the TS-SPS ZnO, while the lowest thermal conductivity of 4.7 W K ¹1 m ¹1 was achieved for the OS-SPS ZnO, attaining a figure of merit (ZT) of 0.017 at 775 °C.

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Record‐High Thermoelectric Performance in Al‐Doped ZnO via Anderson Localization of Band Edge States

Serhiienko,

Novitskii,

Garmroudi

et al. 2024

Advanced Science

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Oxides are of interest for thermoelectrics due to their high thermal stability, chemical inertness, low cost, and eco‐friendly constituting elements. Here, adopting a unique synthesis route via chemical co‐precipitation at strongly alkaline conditions, one of the highest thermoelectric performances for ZnO ceramics ( 21.5 µW cm−1 K−2 and 0.5 at 1100 K in ) is achieved. These results are linked to a distinct modification of the electronic structure: charge carriers become trapped at the edge of the conduction band due to Anderson localization, evidenced by an anomalously low carrier mobility, and characteristic temperature and doping dependencies of charge transport. The bi‐dimensional optimization of doping and carrier localization enable a simultaneous improvement of the Seebeck coefficient and electrical conductivity, opening a novel pathway to advance ZnO thermoelectrics.

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Thermoelectric properties of In- and Ga-doped spark plasma sintered ZnO ceramics

Cited by 22 publications

References 41 publications

Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Characterization of ZnO thermoelectric ceramics and their microstructures consolidated by two-step spark plasma sintering

Record‐High Thermoelectric Performance in Al‐Doped ZnO via Anderson Localization of Band Edge States

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