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Structural Chemistry of Some Phases in The YC-Ni-B System

Published online by Cambridge University Press:  22 February 2011

B. C. Chakoumakos
B. C. Chakoumakos*
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6393
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Abstract

NiB, monoclinic Ni4B3, Ni2B and Ni3B were prepared by arc-melting and their roomtemperature 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 Å), two intermediate (2.152 Å), and four long (2.163 Å) 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 547
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

1 Siegrist, T., Zandbergen, H. W., Cava, R. J., Krajewski, J. J. and Peck, W. F. Jr., Nature 367, 54 (1994).Google Scholar
2 Pearson, W. B., J. Solid State Chem. 56 (1985) 278.Google Scholar
3 Chong, Zheng and Hoffmann, R., J. Am. Chem. Soc. 108 (1986) 3078.Google Scholar
4 Braun, H. F., Engel, N., and Parthe, E., Phys. Rev. B 28, 1389 (1983).Google Scholar
5 Hoffmann, R. and Chong, Zheng, J. Phys. Chem. 89, 4175 (1985).Google Scholar
6 Huang, Q., Chakoumakos, B. C., Santoro, A., cava, R. J., Krajewski, J. J., and Peck, W. F. Jr., Physica C, in press.Google Scholar
7 Rietveld, H. M., J. Appl. Cryst. 2, 65 (1969).Google Scholar
8 Larson, A. C. and Von Dreele, R. B., GSAS—General Structure Analysis System. Report LA-UR-86-748, Los Alamos National Laboratory, Los Alamos, NM 87545, 1990.Google Scholar
9 Thompson, P., Cox, D. E., and Hastings, J. B., J. Appl. Cryst. 20, 79 (1987).Google Scholar
10 Von Dreele, R. B. in Modern Powder Diffraction, edited by Bish, D. L. and Post, J. E. (Mineralogical Society of America, Washington, 1989) pp. 333–369.Google Scholar
11 Sears, V. F., Neutron News 3, 26 (1992).Google Scholar
12 Villars, P. and Calvert, L. D., Pearson's Handbook of Crystallographic Data for Intermetallic Phases, Vols. 1-4 (ASM International, Materials Park, Ohio, 1991).Google Scholar
13 Chakoumakos, B. C. and Paranthaman, M., Physica C 227, 143 (1994).Google Scholar
14 Spear, K. E., Applications of Phase Diagrams in Metallurgy and Ceramics, Vol. 2 (NBS Special Publication 496, 1978) pp. 744–762.Google Scholar
15 Wells, A. F., Structural Inorganic Chemistry, 5th ed. (Oxford University Press, New York, 1984) pp. 1052–1057.Google Scholar
16 Xu, M., Canfield, P. C., Ostenson, J. E., Finnemore, D. K., Cho, B. K., Wang, Z. R., and Johnston, D. C., Physica C 227, 321 (1994).Google Scholar