Assignment of enantiomorphs for the chiral allotrope β-Mn by diffraction methods

Burkhardt, Ulrich; Winkelmann, Aimo; Borrmann, Horst; Dumitriu, A.; König, Markus; Cios, Grzegorz; Grin, Yuri

doi:10.1126/sciadv.abg0868

Cited by 14 publications

(12 citation statements)

References 34 publications

(56 reference statements)

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“…We found that CCs contribute <20% of Earth's K, equivalent to a maximum contribution of ~13% to Earth by mass over all elements (assuming no volatile loss during or after delivery). This is consistent with previous estimates of several percent to 10% by mass (33,34), suggesting that Earth's K has a predominant NC origin. The small contribution of CCs for K and other elements (33,34) is incompatible with a pebble accretion origin of rocky planets (5,35), but is consistent with the hypothesis that dustdrift barriers separated the CC and NC reservoirs from each other (25,26,34).…”

Section: Origin Of Earth's Ksupporting

confidence: 93%

“…This is consistent with previous estimates of several percent to 10% by mass (33,34), suggesting that Earth's K has a predominant NC origin. The small contribution of CCs for K and other elements (33,34) is incompatible with a pebble accretion origin of rocky planets (5,35), but is consistent with the hypothesis that dustdrift barriers separated the CC and NC reservoirs from each other (25,26,34). (A) Because the CM group has e 40 K = 0.42 ± 0.99, which overlaps with that of the Earth, any fraction of K from CMs is allowed.…”

Section: Origin Of Earth's Ksupporting

confidence: 93%

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Meteorites have inherited nucleosynthetic anomalies of potassium-40 produced in supernovae

Nie

Torrano

et al. 2023

Science

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Meteorites record processes that occurred before and during the formation of the Solar System in the form of nucleosynthetic anomalies: isotopic compositions that differ from the Solar System patterns. Nucleosynthetic anomalies are rarely seen in volatile elements such as potassium at bulk meteorite scale. We measured potassium isotope ratios in 32 meteorites and identified nucleosynthetic anomalies in the isotope potassium-40. The anomalies are larger and more variable in carbonaceous chondrite (CC) meteorites than in noncarbonaceous (NC) meteorites, indicating that CCs inherited more material produced in supernova nucleosynthesis. The potassium-40 anomaly of Earth is close to that of the NCs, implying that Earth’s potassium was mostly delivered by NCs.

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Section: Origin Of Earth's Ksupporting

confidence: 93%

Section: Origin Of Earth's Ksupporting

confidence: 93%

Meteorites have inherited nucleosynthetic anomalies of potassium-40 produced in supernovae

Nie

Torrano

et al. 2023

Science

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“…For β-Mn, we can thus conclude that a reliable assignment of the sense of chirality is possible using Kikuchi diffraction patterns measured in the SEM. Furthermore, this also applies to multi-element compounds with the β-Mn structure type, for which the sense of chirality can be confirmed by X-ray diffraction using anomalous scattering effects [42].…”

Section: Chirality Dependent Kikuchi Diffraction Pattern Matchingmentioning

confidence: 95%

Fixing Left and Right: Assignment of Chiral Elemental Crystal Structures using Kikuchi Diffraction

Winkelmann¹,

Cios²,

Tokarski³

et al. 2020

Preprint

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Crystals of the chemical elements manganese, tellurium, and selenium can show the effects of handedness. For crystallographic materials analysis, this implies that the presence of two, physically different, enantiomorphic, variants of these elemental crystal structures needs to be taken into account, because of the possible effects of a changing sense of chirality on the properties of the material. Due to fundamental limitations of kinematical X-ray scattering in crystals, however, the effects of chirality in single-element crystals are very difficult to sense using standard X-ray diffraction techniques. In the present paper, we show that dynamical Kikuchi diffraction in the scanning electron microscope is sensitive to the local sense of chirality in crystals of single chemical elements. We demonstrate chirality assignment in β-manganese, and we determine the sense of crystal chirality from Kikuchi diffraction patterns of the trigonal structures of tellurium and selenium.

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“…Aiming to explore new potential thermoelectric materials with ultralow lattice thermal conductivity, we found a group of ternary tellurides with a structural organization similar to the β-Mn structure. − These filled β-manganese-type phases have the chemical composition M 2/ n n + Tr 6 3+ Q 10 2– ( M n+ : Li + , Na + , Ag + , Ca 2+ , Sn 2+ , Pb 2+ , Yb 2+ ; Tr 3 + : Al 3+ , Ga 3+ , In 3+ ; Q 2– : Se 2– , Te 2– ) and are characterized by close packings of Q 4 -tetrahedra, which is similar to the arrangement of manganese atoms in the cubic β-Mn. When M + ions fill all available distorted octahedral voids, the M 2+ ions occupy only half of them, and Tr 3+ ions are distributed in an ordered wayover 15% of the tetrahedral voids.…”

Section: Introductionmentioning

confidence: 99%

Lone-Pair-Like Interaction and Bonding Inhomogeneity Induce Ultralow Lattice Thermal Conductivity in Filled β-Manganese-Type Phases

et al. 2022

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Finding a way to interlink heat transport with the crystal structure and order/disorder phenomena is crucial for designing materials with ultralow lattice thermal conductivity. Here, we revisit the crystal structure and explore the thermoelectric properties of several compounds from the family of the filled β-Mn-type phases M 2/ n n + Ga 6 Te 10 ( M = Pb, Sn, Ca, Na, Na + Ag). The strongly disturbed thermal transport observed in the investigated materials originates from a three-dimensional Te–Ga network with lone-pair-like interactions, which results in large variations of the Ga–Te and M –Te interatomic distances and substantial anharmonic effects. In the particular case of NaAgGa 6 Te 10 , the additional presence of different cations leads to bonding inhomogeneity and strong structural disorder, resulting in a dramatically low lattice thermal conductivity (∼0.25 Wm –1 K –1 at 298 K), being the lowest among the reported β-Mn-type phases. This study offers a way to develop materials with ultralow lattice thermal conductivity by considering bonding inhomogeneity and lone-pair-like interactions.

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Assignment of enantiomorphs for the chiral allotrope β-Mn by diffraction methods

Cited by 14 publications

References 34 publications

Meteorites have inherited nucleosynthetic anomalies of potassium-40 produced in supernovae

Meteorites have inherited nucleosynthetic anomalies of potassium-40 produced in supernovae

Fixing Left and Right: Assignment of Chiral Elemental Crystal Structures using Kikuchi Diffraction

Lone-Pair-Like Interaction and Bonding Inhomogeneity Induce Ultralow Lattice Thermal Conductivity in Filled β-Manganese-Type Phases

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