The structure of defect manganese silicides

Ridder, R. de; Amelinckx, S.

doi:10.1016/0025-5408(71)90058-4

Cited by 74 publications

(26 citation statements)

References 2 publications

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“…The co-existence of different HMS phases has been found in our XRD, HRTEM and SAED results as well as in previous works 29,31 . While the SEM image of Fig.…”

Section: Resultssupporting

confidence: 90%

“…An HMS crystal rod with B6 mm diameter and 10 mm length was grown using the Bridgman method. As discussed in the Supplementary Methods, the X-ray diffraction (XRD) pattern of the HMS sample is matched best with that of the Mn 27 Si 47 phase, although the coexistence of other HMS phases is possible 29 . As shown in Fig.…”

Section: Resultsmentioning

confidence: 85%

“…While the SEM image of Fig. 1c reveals some MnSi layers approximately perpendicular to the c axis and separated by about 20 mm distance, such surface measurements are not capable of detecting the MnSi layers buried under the surface as well as different HMS phases stacked perpendicular to the c axis caused by the modulation of the Si ladder 11,29,31 . The interfaces between different HMS and MnSi phases scatter phonons in a manner similar to phonon-boundary scattering in a thin film or a thin film superlattice structure, which has little effect on phonons travelling nearly parallel to the interface and making significant contribution to the in-plane heat current [47][48][49][50] .…”

Section: Resultsmentioning

confidence: 90%

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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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“…The co-existence of different HMS phases has been found in our XRD, HRTEM and SAED results as well as in previous works 29,31 . While the SEM image of Fig.…”

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 90%

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

et al. 2015

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“…These results are typical of chimney ladder phases in general. The source of this overall pattern has been determined (40,41).…”

Section: Electron Diffractionmentioning

confidence: 99%

RuGavSnw Nowotny Chimney Ladder Phases and the 14-Electron Rule

Lin

You³

et al. 2002

Journal of Solid State Chemistry

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“…High resolution electron microscopy de Ridder and van Tenderloo studied chimney-ladder compounds in the Mn± ±Si system by SAED and HRTEM [27,30]. They observed Moire Â fringes in HRTEM images and could relate them directly to spacing and orientation anomalies between satellites spots belonging to different basic reflections.…”

Section: Electron Diffractionmentioning

confidence: 99%

On the question of commensurability – The Nowotny chimney-ladder structures revisited

Rohrer¹,

Lind²,

Eriksson³

et al. 2000

Zeitschrift Für Kristallographie - Crystalline Materials

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A composite approach was used for the structure solution and refinement of two new Nowotny chimney-ladder phases, (Mo/Rh) 11 Ge 18 and (Mo/Rh) 13 Ge 22 , found during investigations in the Mo/Rh/Ge system. The descriptions of the phases with conventional models (in I 42d (No. 122) with a 5.885(2) A, c 52.62(2) A for (Mo/Rh) 11 Ge 18 and a 5.922(1) A, c 62.88(4) A for (Mo/Rh) 13 Ge 22 ) led to high numbers of unobserved reflections, high parameter/reflection ratios and an unstable refinement in the case of (Mo/Rh) 13 Ge 22 . Microscopy studies showed that the phases were in fact incommensurately modulated. Therefore, a composite model consisting of a rather stable diamond-like transition-metal substructure and a helical main-group-metal arrangement was developed. For the refinement of both phases, (Mo/Rh) 11 Ge 18 as well as (Mo/Rh) 13 Ge 22 , the same model ± ± same space group pair (W : P4=nnc : q 1q1 P : I4 1 /amd : 1 1ss), same atom positions and modulation waves ± ± was used. The refinements converged rapidly, showing that the presented structure model is very general, and may well be applicable to any Nowotny chimney-ladder phase.

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The structure of defect manganese silicides

Cited by 74 publications

References 2 publications

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

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

RuGavSnw Nowotny Chimney Ladder Phases and the 14-Electron Rule

On the question of commensurability – The Nowotny chimney-ladder structures revisited

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