Structural chemistry of some phases in the YC-Ni-B system

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NiB, monoclinic Ni{sub 4}B{sub 3}, Ni{sub 2}B and Ni{sub 3}B were prepared by arc-melting and their room-temperature crystal structures were refined by Rietveld analysis of neutron powder diffraction data. The NiB refinement is altogether new data. Although the B atoms in NiB form characteristic zigzag chains, the primary coordination of each atom by atoms of the other kind is similar and distinctively sevenfold, with one short (2.117 {angstrom}), two intermediate (2.152 {angstrom}), and four long (2.163 {angstrom}) bonds. Other samples with stoichiometries (YC)nNi{sub 2}B{sub 2}, n = 3, 4, did not yield single-phase material, but both x-ray and neutron powder ... continued below

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6 p.

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Chakoumakos, B.C. December 31, 1994.

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Description

NiB, monoclinic Ni{sub 4}B{sub 3}, Ni{sub 2}B and Ni{sub 3}B were prepared by arc-melting and their room-temperature crystal structures were refined by Rietveld analysis of neutron powder diffraction data. The NiB refinement is altogether new data. Although the B atoms in NiB form characteristic zigzag chains, the primary coordination of each atom by atoms of the other kind is similar and distinctively sevenfold, with one short (2.117 {angstrom}), two intermediate (2.152 {angstrom}), and four long (2.163 {angstrom}) bonds. Other samples with stoichiometries (YC)nNi{sub 2}B{sub 2}, n = 3, 4, did not yield single-phase material, but both x-ray and neutron powder diffraction suggest that the n = 4 structure is present in both of these samples. Phase-pure samples of these homologues may require non-stoichiometry and a more controlled thermal history than is attainable by arc melting. To screen samples for superconductivity, ac susceptibility measurements were made using the mutual inductance method with ac signal of 200 Hz.

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6 p.

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OSTI as DE95007403

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994

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  • Other: DE95007403
  • Report No.: CONF-941144--76
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/28367 | External Link
  • Office of Scientific & Technical Information Report Number: 28367
  • Archival Resource Key: ark:/67531/metadc668459

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  • December 31, 1994

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 21, 2016, 12:36 p.m.

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Chakoumakos, B.C. Structural chemistry of some phases in the YC-Ni-B system, report, December 31, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc668459/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.