Oxygen vacancy revived phonon-glass electron-crystal in SrTiO3

Rahman, Jamil Ur; Nam, Woo Hyun; Dư, Nguyễn Văn; Rahman, Gul; Rahman, Altaf Ur; Shin, Weon Ho; Seo, Won‐Seon; Kim, Myong Ho; Lee, Soonil

doi:10.1016/j.jeurceramsoc.2018.09.036

Cited by 74 publications

(44 citation statements)

References 38 publications

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“…Temperature-dependent (a) total thermal conductivity, (b) lattice thermal conductivity, (c) power factor, (d) DFT calculated powder factor for various carriers concentrations, (e) temperature-dependent ratio of the electrical to thermal properties (σ/κ), and (d) ZT values of various oxygen-deficient SrTiO 3 samples. [60].…”

Section: Resultsmentioning

confidence: 99%

Challenges in Improving Performance of Oxide Thermoelectrics Using Defect Engineering

Rahman¹,

Rahman²,

Lee³

2022

Thermoelectricity - Recent Advances, New Perspectives and Applications

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Oxide thermoelectric materials are considered promising for high-temperature thermoelectric applications in terms of low cost, temperature stability, reversible reaction, and so on. Oxide materials have been intensively studied to suppress the defects and electronic charge carriers for many electronic device applications, but the studies with a high concentration of defects are limited. It desires to improve thermoelectric performance by enhancing its charge transport and lowering its lattice thermal conductivity. For this purpose, here, we modified the stoichiometry of cation and anion vacancies in two different systems to regulate the carrier concentration and explored their thermoelectric properties. Both cation and anion vacancies act as a donor of charge carriers and act as phonon scattering centers, decoupling the electrical conductivity and thermal conductivity.

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Section: Resultsmentioning

confidence: 99%

Challenges in Improving Performance of Oxide Thermoelectrics Using Defect Engineering

Rahman¹,

Rahman²,

Lee³

2022

Thermoelectricity - Recent Advances, New Perspectives and Applications

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“…Undoped STO shows poor to moderate thermoelectric performance even in reducing atmosphere [16][17][18][19][20][21] and donor doping on the A-and B-site is a common approach to enhance the TE-properties. The variation in zT for La-doped STO has been reported in [22][23][24] showing zT values between 0.…”

Section: S T Ztmentioning

confidence: 99%

“…16 and 0.37. The highest zT was reported by Kikuchi et al[23] reaching 0.37 at 772 o C based on spark plasma sintered (SPS) combustion synthesized powder.…”

mentioning

confidence: 98%

Thermoelectric properties of A-site deficient La-doped SrTiO3 at 100–900 °C under reducing conditions

Singh

Kanas

Desissa

et al. 2020

Journal of the European Ceramic Society

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Lanthanum doped strontium titanate is a potential n-type thermoelectric material at moderate and high temperatures. (La0.12Sr0.88)0.95TiO3 ceramics were prepared by two different routes, conventional sintering at 1500 °C and spark plasma sintering at temperatures between 925 and 1200 °C. Samples with grain size between 40 nm and 1.4 µm were prepared and characterized with respect to their thermoelectric transport properties at temperatures between 100 and 900 o C under reducing conditions (H2/H2O-buffer mixtures). The thermal conductivity was significantly reduced with decreasing grain size reaching a value of 1.3 W . m -1. K -1 at 600 °C for grain size of 40 nm and porosity of 19 %. Electrical conductivity increased with increasing grain size showing a maximum of 500 S . cm -1 at 200 °C for a grain size of 1.4 µm. The highest figure-of-merit (zT) was measured for samples with 1.4 m average grain size reaching 0.2 at 500 °C.

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“…The PF of sample Sto-C [270] is 2.3 mW m –1 K –2 at 323 K, close to that of sample Sto:La 2 mol %-C [160]. Sample Sto:La 2 mol %-C [270] has the highest PF value of 2.5 mW m –1 K –2 at 323 K. Its PF is higher than that of many SrTiO 3 ceramics. , The SrTiO 3 films are normally produced along the [100] or [110] direction. − Based on our experimental results of the single crystals, higher TE properties should be achieved along the [270] direction of the films. The optimization of the crystal orientation provides an efficient way to improve the TE properties.…”

Section: Results and Discussionmentioning

confidence: 85%

“…The narrower band gap indicates that better TE properties can be obtained in the latter two directions. 27 Figure 2 shows the DOS and PDOS of the unit cell with different cleaving surfaces. The VBM of SrTiO 3 is composed of O 2p states.…”

Section: Resultsmentioning

confidence: 99%

Effect of Crystal Orientation on Seebeck Coefficient and Electrical Conductivity of SrTiO₃ Single Crystals

Wang

et al. 2021

Crystal Growth & Design

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Strontium titanate is a promising thermoelectric material used in harsh environment owing to its high thermoelectric performance and excellent stability at high temperatures. Hence, it has potential application in power generation and sensor through direct conversion between heat and electricity. However, due to its perovskite structure, the relationship between thermoelectric properties and crystal orientation has rarely been studied. In this paper, we prepared La (0−5 mol %)-doped SrTiO 3 single crystals with the introduction of oxygen vacancies. Electrical conductivity is improved by both La doping and the introduction of oxygen vacancy. More importantly, the thermoelectric properties of the samples show strong anisotropy. After annealing in carbon at 1773 K for 8 h, the power factor (PF) of the SrTiO 3 single crystal at 323 K in the [270] direction is 2.3 mW m −1 K −2 , much higher than that in the [160] direction (1.3 mW m −1 K −2 ). A similar phenomenon was also observed in the La-doped single crystals, but the difference becomes smaller. The PF of the 2 mol % La-doped single crystal after annealing in carbon powder is 2.5 mW m −1 K −2 in the [270] direction and 2.3 mW m −1 K −2 in the [160] direction. The two common directions, [110] and [100], are not suitable for the high TE properties of the SrTiO 3 single crystals. The results are valuable for the design of perovskite thermoelectric materials.

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Oxygen vacancy revived phonon-glass electron-crystal in SrTiO3

Cited by 74 publications

References 38 publications

Challenges in Improving Performance of Oxide Thermoelectrics Using Defect Engineering

Challenges in Improving Performance of Oxide Thermoelectrics Using Defect Engineering

Thermoelectric properties of A-site deficient La-doped SrTiO3 at 100–900 °C under reducing conditions

Effect of Crystal Orientation on Seebeck Coefficient and Electrical Conductivity of SrTiO₃ Single Crystals

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Oxygen vacancy revived phonon-glass electron-crystal in SrTiO3

Cited by 74 publications

References 38 publications

Challenges in Improving Performance of Oxide Thermoelectrics Using Defect Engineering

Challenges in Improving Performance of Oxide Thermoelectrics Using Defect Engineering

Thermoelectric properties of A-site deficient La-doped SrTiO3 at 100–900 °C under reducing conditions

Effect of Crystal Orientation on Seebeck Coefficient and Electrical Conductivity of SrTiO3 Single Crystals

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Thermoelectric properties of A-site deficient La-doped SrTiO3 at 100–900 °C under reducing conditions

Effect of Crystal Orientation on Seebeck Coefficient and Electrical Conductivity of SrTiO₃ Single Crystals