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  • Tang, HuCtr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China (author)

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

  • Article/chapterEnglish2020

Publisher, publication year, extent ...

  • 2019-12-10
  • AMER CHEMICAL SOC,2020
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-406060
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-406060URI
  • https://doi.org/10.1021/acs.chemmater.9b04052DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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.

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  • Gao, XiangCtr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China (author)
  • Zhang, JianShandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China (author)
  • Gao, BoCtr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China (author)
  • Zhou, WenjuCtr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China;Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China (author)
  • Yan, BingminCtr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China (author)
  • Li, XueJilin 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 (author)
  • Zhang, QinghuaChinese Acad Sci, Beijing Natl Lab Condensed Matter, Beijing 100190, Peoples R China;Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China (author)
  • Peng, ShangWuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China (author)
  • Huang, DajianCtr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China (author)
  • Zhang, LijunYanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China (author)
  • Yuan, XiaohongCtr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China (author)
  • Wan, BiaoYanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China (author)
  • Peng, ChongYanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China (author)
  • Wu, LaileiYanshan Univ, Coll Mat Sci & Engn, Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China (author)
  • Zhang, DongzhouUniv Hawaii Manoa, Hawaii Inst Geophys & Planetol, Sch Ocean & Earth Sci & Technol, Honolulu, HI 96822 USA (author)
  • Liu, HanyuJilin 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 (author)
  • Gu, LinChinese Acad Sci, Beijing Natl Lab Condensed Matter, Beijing 100190, Peoples R China;Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China (author)
  • Gao, FamingYanshan Univ, Coll Environm & Chem Engn, Key Lab Appl Chem, Qinhuangdao 066004, Hebei, Peoples R China (author)
  • Irifune, TetsuoEhime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan (author)
  • Ahuja, Rajeev,1965-Uppsala universitet,Materialteori,Condensed Matter Theory Group(Swepub:uu)rajeeva (author)
  • Mao, Ho-KwangCtr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China (author)
  • Gou, HuiyangCtr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China (author)
  • Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R ChinaShandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China (creator_code:org_t)

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  • In:Chemistry of Materials: AMER CHEMICAL SOC32:1, s. 459-4670897-47561520-5002

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