Thermoelectric properties and power generation characteristics of sintered undoped n-type Mg2Si

Sakamoto, Tatsuya; Iida, Tsutomu; Fukushima, Naoki; Honda, Yasuhiko; Tada, Mitsuhiro; Taguchi, Yutaka; Mito, Yohiko; Taguchi, Hayao; Takanashi, Yoshifumi

doi:10.1016/j.tsf.2011.05.031

Cited by 27 publications

(10 citation statements)

References 7 publications

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“…Such transition at higher temperature in terms of the electrical conductivity and Seebeck coefficient was also observed by Iida et al [29,30]. The temperature dependences of the Seebeck coefficient is illustrated by Figure 4b.…”

Section: Electronic Structuresupporting

confidence: 82%

Electronic Structure and Thermal Study of Ag3PS4 and Ag5PS4Cl2 from Direct to Indirect Energy Gap

AH¹,

Azam²

2013

J Material Sci Eng

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The band structure and density of states of the orthorhombic Ag 3 PS 4 and Ag 5 PS 4 Cl 2 compounds has been investigated. The calculations are derived from the total-energy calculations using the Full Potential-Linearized Augmented Plane Wave (FPLAPW) method. The exchange and correlation potential is treated by the Local Density Approximation (LDA), Generalized Gradient Approximation (GGA) and Engel Vosko GGA. From the study of the band structure we confirmed that the Valence Band Maximum (VBM) and Conduction Band Minimum (CBM) of Ag 3 PS 4 compounds situated at Г point, indicating a direct band gap. While for Ag 5 PS 4 Cl 2 compound the VBM occurs along the Z-S direction and CBM at Г point exhibiting indirect band gap. The partial density of states confirm that the lower part of the valence band is dominated by S-s orbital, the mid part by P-s orbital and the VBM by the Ag-d orbital. The conduction band consists the major contribution of Ag-s/p orbital. Furthermore, the thermoelectric properties of both compounds were investigated by means of BoltzTraP code. The electrical conductivity, electrical resistivity, the power factor and Seebeck coefficient were investigated in the temperature range from 300 to 800 K. The electrical conductivity was enhanced by increasing the temperature, which leads to a small electrical resistivity and a large Seebeck coefficient. Consequently, large values of about 3.75×10 11 and 1.2×10 11 W/m K 2 for Ag 3 PS 4 and Ag 5 PS 4 Cl 2 compounds were obtained. Therefore, the thermoelectric property of Ag 3 PS 4 is not as good as that of Ag 5 PS 4 Cl 2 . Therefore, it can be concluded that Ag 5 PS 4 Cl 2 is suitable for high performance thermoelectric application than Ag 3 PS 4 at higher temperature.

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Section: Electronic Structuresupporting

confidence: 82%

Electronic Structure and Thermal Study of Ag3PS4 and Ag5PS4Cl2 from Direct to Indirect Energy Gap

AH¹,

Azam²

2013

J Material Sci Eng

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“…Unfortunately, the result are modest (e.g. the power density of n-type Mg 2 Si reported by Sakamoto et al 17) in the same temperature range is 1.43 W·cm…”

Section: ¹2mentioning

confidence: 85%

Thermoelectric properties of bismuth-substituted calcium manganite Ca1−xBixMnO3−δ prepared via the electrostatic spray deposition method

Fujimoto

Gibu

Yamaguchi

et al. 2017

J. Ceram. Soc. Japan

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The thermoelectric properties of Ca 1¹x Bi x MnO 3¹¤ sintered bodies prepared by the electrostatic spray deposition method and sintering technology were evaluated. ) at 300 K. The increase in carrier concentration contributed to higher conductivity, power factor and power generation density in the Bi-substituted compound. In thermoelectric performance evaluations, the power density reached 625 mW·cm ¹2 for Ca 0.95 Bi 0.05 MnO 3¹¤ with a temperature difference of 444 K, an 11-fold increase compared to the parent compound CaMnO 3¹¤ (57 mW·cm ¹2).

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“…And for the case of Ni, complex new phases that may form at the Ni/Mg 2 Si interface complicate the relationship between processing and the contact resistance of the product [8]. To enhance the output power and reduce the contact resistance, efforts have been made to develop appropriate electrode materials for magnesium silicide [11][12][13]. Transition 12 Ni 31, which showed good adhesion to both the Ni electrode and the Mg 2 Si.…”

Section: Introductionmentioning

confidence: 99%

Interfacial properties of Cu/Ni/Mg2Si joints prepared in one step by the spark plasma sintering method

Yang

Chen

Fan

et al. 2017

Journal of Alloys and Compounds

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Cu/Ni/Mg 2 Si thermoelectric bonded joints were prepared in one step by the spark plasma sintering (SPS) method using Mg and Si powders to form Mg 2 Si. The microstructure and elemental distribution across the interfaces were determined, and the formation of new phases at the interface was investigated and related to joint properties, including shear strength and contact resistance. Joint formation was accompanied by the formation of two ternary Mg-Si-Ni layers, an η-layer with Ni 2 Si as a precipitate next to Ni, and an ω-layer next to Mg 2 Si. The formation and characteristics of these layers played a major role in determining the shear strength and contact resistance. It was determined that a reactive sintering temperatures in the range 1023-1053K with a 15-20 min hold time provided the best properties. The maximum shear strength of the joints obtained is 26MPa for samples sintered at 1023K. For these samples the contact resistance was 1.44 mΩ•cm 2 ; the minimum value of 1.28mΩ•cm 2 was measured for samples sintered at 1073K. Long-term thermal stability of joints was also investigated.

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Thermoelectric properties and power generation characteristics of sintered undoped n-type Mg2Si

Cited by 27 publications

References 7 publications

Electronic Structure and Thermal Study of Ag3PS4 and Ag5PS4Cl2 from Direct to Indirect Energy Gap

Electronic Structure and Thermal Study of Ag3PS4 and Ag5PS4Cl2 from Direct to Indirect Energy Gap

Thermoelectric properties of bismuth-substituted calcium manganite Ca<sub>1−</sub><i><sub>x</sub></i>Bi<i><sub>x</sub></i>MnO<sub>3−δ</sub> prepared via the electrostatic spray deposition method

Interfacial properties of Cu/Ni/Mg2Si joints prepared in one step by the spark plasma sintering method

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Thermoelectric properties and power generation characteristics of sintered undoped n-type Mg2Si

Cited by 27 publications

References 7 publications

Electronic Structure and Thermal Study of Ag3PS4 and Ag5PS4Cl2 from Direct to Indirect Energy Gap

Electronic Structure and Thermal Study of Ag3PS4 and Ag5PS4Cl2 from Direct to Indirect Energy Gap

Thermoelectric properties of bismuth-substituted calcium manganite Ca<sub>1&minus;</sub><i><sub>x</sub></i>Bi<i><sub>x</sub></i>MnO<sub>3&minus;&delta;</sub> prepared via the electrostatic spray deposition method

Interfacial properties of Cu/Ni/Mg2Si joints prepared in one step by the spark plasma sintering method

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Product

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Thermoelectric properties of bismuth-substituted calcium manganite Ca<sub>1−</sub><i><sub>x</sub></i>Bi<i><sub>x</sub></i>MnO<sub>3−δ</sub> prepared via the electrostatic spray deposition method