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Boron-Rich Molybdenum Boride with Unusual Short-Range Vacancy Ordering, Anisotropic Hardness, and Superconductivity
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China.
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China.
Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
Ctr High Pressure Sci & Technol Adv Res, Beijing 100094, Peoples R China.
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2020 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 32, no 1, p. 459-467Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2020. Vol. 32, no 1, p. 459-467
National Category
Materials Chemistry
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URN: urn:nbn:se:uu:diva-406060DOI: 10.1021/acs.chemmater.9b04052ISI: 000507721600046OAI: oai:DiVA.org:uu-406060DiVA, id: diva2:1411871
Funder
The Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Available from: 2020-03-04 Created: 2020-03-04 Last updated: 2020-03-04Bibliographically approved

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Ahuja, Rajeev

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