Directional thermoelectric properties of Ru2Si3

Simkin, B.A.; Hayashi, Yoshinori; Inui, Haruyuki

doi:10.1016/j.intermet.2005.04.006

Cited by 31 publications

(21 citation statements)

References 23 publications

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“…This compound is one of the Nowotny chimney-ladder (NCL) phases with the valence electron concentration (VEC) ∼ 14 [9]. The other promising thermoelectric materials of NCL phases are reported in such as Ru 2 Si 3 [10] and Ru 1−x Re x Si y [11] alloys. The temperature dependence of the electrical conductivity from room temperature to 670 K has been reported by Evers et al [12], and pioneering studies on the thermoelectric properties of a hot-pressed sample have been reported by Amagai et al [13].…”

Section: Introductionmentioning

confidence: 99%

Composition dependence of thermoelectric properties of binary narrow-gap Ga67−xRu33+x compound

Takagiwa

Okada

Kimura

2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Composition dependence of thermoelectric properties of binary narrow-gap Ga67−xRu33+x compound

Takagiwa

Okada

Kimura

2010

Journal of Alloys and Compounds

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“…Bulk thermoelectric chimney-ladder silicides, such as Ru 2 Si 3 , Mn 4 Si 7 and so forth, are known to possess a particular tetragonal crystal structure [2][3]. Chimney-ladder silicides expressed with the general chemical formula of M n Si 2n-m (M: transition metal element, n, m: integers) possess a unit cell consisting of nM subcells with the atomic arrangement of the β-Sn type (chimney) and mSi subcells with the atomic arrangement of a coupled helices (ladders) with both the chimney and ladder being aligned along the c-axis of the tetragonal unit cell [4][5].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Thermoelectric Properties of the Chimney–Ladder Compounds in the Ru-Mn-Si System

et al. 2009

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Directionally solidified alloys in the Ru-Mn-Si system exhibit a particular microstructure including columnar compositional variation due to the formation of many different chimneyladder phases along the growth direction. Despite the existence of the compositional variation, the crystal orientations of the neighboring chimney-ladder phases are preserved. Over the compositional interfaces, the metal sublattice is considered to be continuous while the Si sublattice is not. Heat treatment of the directionally solidified alloy with the nominal composition of Ru 0.10 Mn 0.90 Si 1.732 at 1100°C coarsens the compositional domains so as to reduce the density of the compositional interfaces. The values of the thermal conductivity increase with the decrease in the density of the compositional interfaces whereas those of the Seebeck coefficient and electrical resistivity are almost unchanged after the heat treatment. It is considered that the thermoelectric properties of the chimney-ladder compounds in the Ru-Mn-Si system can be enhanced by introducing a high density of the compositional interfaces.

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“…M aterials with a complex crystal structure continue to be the subject of a wide range of scientific studies and technological applications 1,2 6 , and intermetallic Nowotny chimney ladder (NCL) phases 7 with potential technological applications in optoelectronic 8 and thermoelectric 9,10 devices. A prominent example of NCL phases is higher manganese silicides (HMS), Mn n Si 2n À m , which consists of a tetragonal Mn chimney sublattice based on the b-Sn structure and a Si ladder sublattice with the atomic arrangement of coupled helices 11 .…”

mentioning

confidence: 99%

Twisting phonons in complex crystals with quasi-one-dimensional substructures

et al. 2015

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A variety of crystals contain quasi-one-dimensional substructures, which yield distinctive electronic, spintronic, optical and thermoelectric properties. There is a lack of understanding of the lattice dynamics that influences the properties of such complex crystals. Here we employ inelastic neutron scatting measurements and density functional theory calculations to show that numerous low-energy optical vibrational modes exist in higher manganese silicides, an example of such crystals. These optical modes, including unusually low-frequency twisting motions of the Si ladders inside the Mn chimneys, provide a large phase space for scattering acoustic phonons. A hybrid phonon and diffuson model is proposed to explain the low and anisotropic thermal conductivity of higher manganese silicides and to evaluate nanostructuring as an approach to further suppress the thermal conductivity and enhance the thermoelectric energy conversion efficiency. This discovery offers new insights into the structure-property relationships of a broad class of materials with quasi-one-dimensional substructures for various applications.

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Directional thermoelectric properties of Ru2Si3

Cited by 31 publications

References 23 publications

Composition dependence of thermoelectric properties of binary narrow-gap Ga67−xRu33+x compound

Composition dependence of thermoelectric properties of binary narrow-gap Ga67−xRu33+x compound

Improvement of the Thermoelectric Properties of the Chimney–Ladder Compounds in the Ru-Mn-Si System

Twisting phonons in complex crystals with quasi-one-dimensional substructures

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