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30. Dynamic Phase Transition Leading to Extraordinary Plastic Deformability of Thermoelectric SnSe2 Single Crystal.

Author

Ge, Bangzhi, Li, Chao, Lu, Weiqun, Ye, Haolin, Li, Ruoyan, He, Wenke, Wei, Zhilei, Shi, Zhongqi, Kim, Dasol, Zhou, Chongjian, Zhu, Menghua, Wuttig, Matthias, and Yu, Yuan

Subjects
PHASE transitions, SINGLE crystals, THERMOELECTRIC apparatus & appliances, BAND gaps, PLASTICS
Abstract

Plastic/ductile inorganic van der Waals (vdW) thermoelectric semiconductors offer transformative advantages for high‐performance flexible thermoelectric devices, which can displace the self‐charge system of wearable electronics. However, the chemical origin of their plasticity remains unclear. Here, it is reported that the exceptionally large plastic strain of the bulk SnSe2 crystal results from its polytype conversion under an external force. The SnSe2 single crystal consists of a large‐period polytype with 18R low‐symmetry structure rather than the trigonal and hexagonal‐phase that are frequently observed in the polycrystalline specimen. In situ applied pressure to the specimen drives a phase transition from low to high‐symmetry, that is, from 18R to 4H, and finally to 2H‐SnSe2. First principle calculations corroborate that the dynamic phase transition is a pressure‐activated process and only 15 MPa pressure erases their energy gaps, consistent with experimentally measured strain–stress curves. This dynamic phase transition results in superior and near isotropic plasticity along the direction parallel and perpendicular to the cleavage plane. [ABSTRACT FROM AUTHOR]

Published
2023
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34. Electronic Structure Manipulation of the Mott Insulator RuCl3 via Single‐Crystal to Single‐Crystal Topotactic Transformation.

Author

Lu, Weiqun, Lee, Hyungseok, Cha, Joonil, Zhang, Jian, and Chung, In

Subjects
*ELECTRONIC structure, *CARRIER density, *PHENOMENOLOGICAL theory (Physics), *ELECTRON distribution, *HONEYCOMB structures, *CHARGE carrier mobility
Abstract

The core task for Mott insulators includes how rigid distributions of electrons evolve and how these induce exotic physical phenomena. However, it is highly challenging to chemically dope Mott insulators to tune properties. Herein, we report how to tailor electronic structures of the honeycomb Mott insulator RuCl3 employing a facile and reversible single‐crystal to single‐crystal intercalation process. The resulting product (NH4)0.5RuCl3⋅1.5 H2O forms a new hybrid superlattice of alternating RuCl3 monolayers with NH4+ and H2O molecules. Its manipulated electronic structure markedly shrinks the Mott–Hubbard gap from 1.2 to 0.7 eV. Its electrical conductivity increases by more than 103 folds. This arises from concurrently enhanced carrier concentration and mobility in contrary to the general physics rule of their inverse proportionality. We show topotactic and topochemical intercalation chemistry to control Mott insulators, escalating the prospect of discovering exotic physical phenomena. [ABSTRACT FROM AUTHOR]

Published
2023
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37. Conflicting effects of predator cue and ocean acidification on the mussel Mytilus coruscus byssus production

Author

Li, Lisha, Lu, Weiqun, Sui, Yanming, Wang, Youji, Gul, Yasmeen, and Dupont, Sam

Subjects
Mussels -- Environmental aspects -- Health aspects, Ocean acidification -- Analysis -- Health aspects -- Environmental aspects, Predation (Biology) -- Environmental aspects -- Health aspects, Biological sciences, Zoology and wildlife conservation
Abstract

ABSTRACT Understanding the impact of ocean acidification and warming on communities and ecosystems is a researcher priority. This can only be achieved through a combination of experimental and field approaches [...]

Published
2015
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