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Boron-Rich Molybdenum Boride with Unusual Short-Range Vacancy Ordering, Anisotropic Hardness, and Superconductivity

Tang, Hu (author)
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China
Gao, Xiang (author)
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China
Zhang, Jian (author)
Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China
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Gao, Bo (author)
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China
Zhou, Wenju (author)
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China;Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China
Yan, Bingmin (author)
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China
Li, Xue (author)
Jilin Univ, State Key Lab Superhard Mat, Coll Phys, Changchun 130012, Peoples R China;Jilin Univ, Innovat Ctr Computat Phys Methods & Software, Coll Phys, Changchun 130012, Peoples R China
Zhang, Qinghua (author)
Chinese Acad Sci, Beijing Natl Lab Condensed Matter, Beijing 100190, Peoples R China;Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
Peng, Shang (author)
Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China
Huang, Dajian (author)
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China
Zhang, Lijun (author)
Yanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China
Yuan, Xiaohong (author)
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China
Wan, Biao (author)
Yanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China
Peng, Chong (author)
Yanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China
Wu, Lailei (author)
Yanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China
Zhang, Dongzhou (author)
Univ Hawaii Manoa, Hawaii Inst Geophys & Planetol, Sch Ocean & Earth Sci & Technol, Honolulu, HI 96822 USA
Liu, Hanyu (author)
Jilin Univ, State Key Lab Superhard Mat, Coll Phys, Changchun 130012, Peoples R China;Jilin Univ, Innovat Ctr Computat Phys Methods & Software, Coll Phys, Changchun 130012, Peoples R China
Gu, Lin (author)
Chinese Acad Sci, Beijing Natl Lab Condensed Matter, Beijing 100190, Peoples R China;Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
Gao, Faming (author)
Yanshan Univ, Coll Environm & Chem Engn, Key Lab Appl Chem, Qinhuangdao 066004, Hebei, Peoples R China
Irifune, Tetsuo (author)
Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan
Ahuja, Rajeev, 1965- (author)
Uppsala universitet,Materialteori,Condensed Matter Theory Group
Mao, Ho-Kwang (author)
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China
Gou, Huiyang (author)
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China
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 (creator_code:org_t)
2019-12-10
2020
English.
In: Chemistry of Materials. - : AMER CHEMICAL SOC. - 0897-4756 .- 1520-5002. ; 32:1, s. 459-467
Related links:
https://urn.kb.se/re...
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https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Determination of the structures of materials involving more light elements such as boron-rich compounds is challenging and technically important in understanding their varied compositions and superior functionalities. Here we resolve the long-standing uncertainties in structure and composition about the highest boride (termed MoB4, Mo1-xB3, or MoB3) through the rapid formation of large sized boron-rich molybdenum boride under pressure. Using high-quality single-crystal X-ray diffraction analysis and aberration-corrected scanning transmission electron microscopy, we reveal that boron-rich molybdenum boride with a composition of Mo0.757B3 exhibits P6(3)/mmc symmetry with a partial occupancy of 0.514 in 211 Mo sites (Mol), and direct observations reveal the short-range ordering of cation vacancies in (010) crystal planes. Large anisotropic Young's moduli and Vickers hardness are seen for Mo0.757B3, which may be attributed by its two-dimensional boron distributions. Mo0.757B3 is also found to be superconducting with a transition temperature (T-c) of 2.4 K, which was confirmed by measurements of resistivity and magnetic susceptibility. Theoretical calculations suggest that the partial occupancy of Mo atoms plays a crucial role in the emergence of superconductivity.

Subject headings

NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

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