Effects of Nb substitution on thermoelectric properties of CrSi2

Nagai, Hiroki; Takamatsu, Tomohisa; Iijima, Yoshihiko; Hayashi, Kei; Miyazaki, Yasumitsu

doi:10.1016/j.jallcom.2016.06.047

Cited by 20 publications

(11 citation statements)

References 21 publications

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“…EDS analyses inside the CrSi 2 phase also revealed a slight diffusion of Nb into CrSi 2 that rapidly fell below the detection limit of the technique at more than 40 µm away from the interface region. The weaker diffusion of Nb compared to Ti in CrSi 2 was consistent with literature data reporting a lower solubility limit of 10 at.% [40]. In the present case, Ti was, therefore, more adapted to the realization of mechanically resistant contacts on CrSi 2 .…”

Section: Fabrication Of Ti and Nb Electric Contacts On Crsisupporting

confidence: 91%

Fabrication and Evaluation of Low-Cost CrSi2 Thermoelectric Legs

et al. 2021

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CrSi2 is a promising thermoelectric material constituted of non-toxic and earth abundant elements that offer good perspectives for the mass production of inexpensive and reliable thermoelectric modules for waste heat recovery. Realization of robust metallic contacts with low electrical and thermal resistances on thermoelectric materials is crucial to maximize the conversion efficiency of such a device. In this article, the metallization of an undoped CrSi2 with Ti and Nb using a conventional Spark Plasma Sintering process is explored and discussed. These contact metals were selected because they have compatible thermal expansion coefficients with those of CrSi2, which were determined in this study by X-ray Diffraction in the temperature range 299–899 K. Ti was found to be a promising contact metal offering both strong adhesion on CrSi2 and negligible electrical contact resistance (<1 μΩ cm2). However, metallization with Nb resulted in the formation of cracks caused by large internal stress inside the sample during the fabrication process and the diffusion of Si in the metallic layer. A maximum conversion efficiency of 0.3% was measured for a sandwiched Ti/CrSi2/Ti thermoelectric leg placed inside a thermal gradient of 427 K. The preliminary results obtained and discussed in this article on a relatively simple case study aim to initiate the development of more reliable and efficient CrSi2 thermoelectric legs with an optimized design.

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Section: Fabrication Of Ti and Nb Electric Contacts On Crsisupporting

confidence: 91%

Fabrication and Evaluation of Low-Cost CrSi2 Thermoelectric Legs

et al. 2021

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“…The Nb substitution leads to decrease of the power factor, however this decrease is outweighed by the suppression of the thermal conductivity of Cr 1− x Nb x Si 2 (

0 \leq x \leq 0.10

). Thus, the maximum

Z T \approx 0.2

was observed for Cr 0.95 Nb 0.05 Si 2 at 700 K (see Figure ) …”

Section: Crsi2mentioning

confidence: 86%

“…Investigation of the effects of Nb substitution on TE properties of Cr 1− x Nb x Si 2 revealed that solubility limit of Nb in CrSi 2 is equal to 0.1 . Polycrystalline samples of Cr 1− x Nb x Si 2 (

0 \leq x \leq 0.15

) were prepared by arc‐melting of CrSi 2 and NbSi 2 , followed by spark plasma sintering.…”

Section: Crsi2mentioning

confidence: 99%

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Silicide Thermoelectrics: Materials for Energy Harvesting

Бурков

2018

Physica Status Solidi (a)

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The silicide family of thermoelectrics includes more than 15 compounds, among them are semimetals and semiconductors with band gaps ranging from 0.1 to 2.3 eV. The silicides have obvious attractive features as the materials for thermoelectric energy converters. Many of the constituting elements are abundant, have low price, the compounds have good high temperature stability. Another feature of silicides, much less recognized by thermoelectric community, is their compatibility with silicon-based microelectronic technology. It opens a door for development of integrated thermoelectric power sources (energy harvesters) for electronic circuitry of wireless sensors and actuators. Considerable efforts have been undertaken, especially in the past 10 years, in order to develop efficient silicide-based thermoelectric materials. Currently the most efficient silicide thermoelectrics are based on Mg 2 (Si-Sn) alloys, MnSi 1.75 and ReSi 1.75 . This article is a review of the current status of the research on the silicide-based thermoelectric materials. Most of the non-transition metal silicides were intentionally excluded from this review. On the other hand more attention is paid to the silicide materials, which have been not in the research focus; to compounds with topologically nontrivial electronic structure, such as CoSi and SrSi 2 .

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“…Several attempts have been made to decrease the thermal conductivity of CrSi 2 [16][17][18][19][20]. Ohishi et al [20] and Nagai et al [21] achieved a significant decrease in the lattice thermal conductivity by partial substitution of the Cr sites in CrSi 2 with Mo and Nb, respectively. As a result, they observed an increase of the maximum zT value in heavy-element substituted (Cr 1−x A x )Si 2 (A = Mo and Nb) samples from 0.12 to 0.23 (x Mo = 0.30) and 0.20 (x Nb = 0.05).…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of Mo and Ge co-substituted CrSi<sub>2</sub>

Nakasawa

Takamatsu

Iijima

et al. 2018

Trans. Mat. Res. Soc. Japan

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The thermoelectric properties of Mo and Ge co-substituted CrSi 2 have been investigated. Polycrystalline samples of (Cr 1−x Mo x )Si 2 (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) and (Cr 0.92 Mo 0.08 )(Si 1−y Ge y ) 2 (y = 0, 0.01, and 0.02) were prepared by the two-step arc-melting method followed by spark plasma sintering and annealing. Powder X-ray diffraction confirmed that single-phase (Cr 1−x Mo x )(Si 1−y Ge y ) 2 samples were obtained. Mo and Ge co-substitution in CrSi 2 resulted in both an increase in the power factor and a large decrease in the thermal conductivity, which resulted in a high figure-of-merit (zT) value for the (Cr 0.92 Mo 0.08 )(Si 0.99 Ge 0.01 ) 2 sample (zT = 0.29 at 700 K). This zT value is the highest reported value for CrSi 2 -based thermoelectric materials.

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Effects of Nb substitution on thermoelectric properties of CrSi2

Cited by 20 publications

References 21 publications

Fabrication and Evaluation of Low-Cost CrSi2 Thermoelectric Legs

Fabrication and Evaluation of Low-Cost CrSi2 Thermoelectric Legs

Silicide Thermoelectrics: Materials for Energy Harvesting

Thermoelectric Properties of Mo and Ge co-substituted CrSi<sub>2</sub>

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