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

B. C. Chakoumakos

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

B. C. Chakoumakos

Single Crystal Diffraction

Research output: Contribution to journal › Conference article › peer-review

Abstract

NiB, monoclinic Ni₄B₃, Ni₂B and Ni₃B 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)_nNi₂B₂, 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.

Original language	English
Pages (from-to)	547-552
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	376
State	Published - 1995
Event	Proceedings of the 1994 MRS Fall Meeting - Boston, MA, USA Duration: Nov 28 1994 → Nov 30 1994

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title = "Structural chemistry of some phases in the YC-Ni-B system",

abstract = "NiB, monoclinic Ni4B3, Ni2B and Ni3B 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)nNi2B2, 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.",

author = "Chakoumakos, {B. C.}",

year = "1995",

language = "English",

volume = "376",

pages = "547--552",

journal = "Materials Research Society Symposium - Proceedings",

issn = "0272-9172",

note = "Proceedings of the 1994 MRS Fall Meeting ; Conference date: 28-11-1994 Through 30-11-1994",

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TY - JOUR

T1 - Structural chemistry of some phases in the YC-Ni-B system

AU - Chakoumakos, B. C.

PY - 1995

Y1 - 1995

N2 - NiB, monoclinic Ni4B3, Ni2B and Ni3B 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)nNi2B2, 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.

AB - NiB, monoclinic Ni4B3, Ni2B and Ni3B 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)nNi2B2, 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.

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M3 - Conference article

AN - SCOPUS:0029518013

SN - 0272-9172

VL - 376

SP - 547

EP - 552

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

T2 - Proceedings of the 1994 MRS Fall Meeting

Y2 - 28 November 1994 through 30 November 1994

ER -

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

Abstract

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