Effect of Ru Substitution for Mn in the Si2Ti-Type Al-Mn-Si Alloy

Yamamoto, Akio; Takeuchi, Tsunehiro

doi:10.1007/s11664-012-2101-y

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…Consequently, the magnitude of ZT increased to $0.09, which is 1.3 times larger than that of the Ru-free samples. 14 Despite proving and demonstrating the validity of this method for the effective reduction of the lattice thermal conductivity, the resulting ZT value was still far below unity that is the generally observable ZT values of practical thermoelectric materials containing tellurium. Thus, in order to further increase the magnitude of ZT of the Al-Mn-Si based C54-phase, in this study, we theoretically identified the heavy elements that cause a significant reduction of the lattice thermal conductivity of the Al-Mn-Si C54-phase without producing impurity states near the chemical potential by means of first principles calculations.…”

Section: Introductionmentioning

confidence: 96%

Thermoelectric properties of Al-(Mn,X)-Si C54-phase (X = Ru and Re)

Yamamoto

Miyazaki

Takeuchi

2014

Journal of Applied Physics

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Microstructures and thermoelectric properties of Fe 0.92 Mn 0.08 Si x alloys prepared by rapid solidification and hot pressingThe lattice thermal conductivity of the Al-Mn-Si C54-phase, which possesses a large magnitude of the Seebeck coefficient and metallic electrical conduction, was greatly reduced by partial substitution of the heavy elements Ru and Re for Mn; these were selected by first principles calculations so as not to produce impurity states near the chemical potential. The heavy element substituted Al-Mn-Si-based C54-phase showed a drastic increase in the dimensionless of figure of merit ZT due to the reduction of the lattice thermal conductivity together with the unchanged electrical properties. The maximum ZT value of the p-type sample and the n-type sample reached 0.12 at 520 K and 0.38 at 540 K, respectively. These values are about five times larger than that of the heavy element-free Al-Mn-Si C54-phase. V C 2014 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 96%

Thermoelectric properties of Al-(Mn,X)-Si C54-phase (X = Ru and Re)

Yamamoto

Miyazaki

Takeuchi

2014

Journal of Applied Physics

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“…In our previous study, we succeeded in effectively reducing the lattice thermal conductivity of the Al-Mn-Si C54 phase and Al-Mn-Si C40 phase without affecting the electron transport properties. [10][11][12] This rather difficult mission was achieved through a small amount of heavy element substitution, with which the electronic structure near the chemical potential was not modified. Notably, HMS possesses very similar local atomic arrangements to those of the C54 phase and C40 phase.…”

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confidence: 99%

Thermoelectric properties of supersaturated Re solid solution of higher manganese silicides

Yamamoto

Ghodke

Miyazaki

et al. 2016

Jpn. J. Appl. Phys.

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In this study, we developed a higher manganese silicide (HMS) that possesses a high dimensionless figure of merit ZT exceeding unity. HMSs containing a larger amount of Re than its solubility limit were prepared by the liquid quenching technique, and the obtained metastable HMSs showed good thermal stability to enable pulse current sintering at 1240 K. The lattice thermal conductivity was effectively reduced with increasing Re concentration, whereas the electron transport properties were not greatly affected. Consequently, the ZT of p-type HMS increased to 1.04 at 6 at. % Re from 0.4 of the Re-free sample.

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“…We eventually found that the Al-Mn-Si C54 phase (Si 2 Ti-type structure) and the Al-Mn-Si C40 phase (CrSi 2 -type structure) possessed good electronic structures leading to a large magnitude of A-factor [7][8][9][10][11][12] . By preparing the samples, we found that C54 phase and C40 phase indeed possess large values of A-factor exceeding 4 and 2, respectively [7][8][9][10][11][12] . Besides, (Ru, Re) substitution for Mn in C54 phase and W substitution in C40 phase lead to signi cant reductions in κ lat without affecting the electron transport properties.…”

Section: Introductionmentioning

confidence: 94%

Thermoelectric Properties of Al-Mn-Si Based C54 Phase Containing Small Amount of C40 Phase

et al. 2016

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The dimensionless gure of merit, ZT, of Al-Mn-Si based C54 phase was effectively increased using the precipitation of a small amount of Al-Mn-Si based C40 phase, which possesses slightly smaller magnitude of both electrical resistivity and Seebeck coef cient than those of C54 phase. We prepared a series of samples by simply alloying Al 37 (Mn 26 at x = 0, 0.01, 0.02, 0.03, 0.05, and 1, and found that the magnitude of Seebeck coef cient remained unchanged at x < 0.03, while the lattice thermal conductivity and electrical resistivity were moderately decreased with increasing x. The maximum ZT has consequently increased up to ZT = 0.42 at x = 0.03 from ZT = 0.38 of the C54-phase at x = 0.

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Effect of Ru Substitution for Mn in the Si2Ti-Type Al-Mn-Si Alloy

Cited by 7 publications

References 13 publications

Thermoelectric properties of Al-(Mn,X)-Si C54-phase (X = Ru and Re)

Thermoelectric properties of Al-(Mn,X)-Si C54-phase (X = Ru and Re)

Thermoelectric properties of supersaturated Re solid solution of higher manganese silicides

Thermoelectric Properties of Al-Mn-Si Based C54 Phase Containing Small Amount of C40 Phase

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