Abstract
Crystal approximant phases are important because they are believed to have a similar local atomic structure to corresponding quasicrystals. Interstitial hydrogen is used as a probe of the local structures of the Ti-based quasicrystals and crystal approximants. Phase pure samples of ct(TiCrSiO), a Mackay type 1/1 crystal approximant, which were plasma etched and coated with a thin layer of Pd, were loaded with deuterium from the gas phase to a maximum deuterium atom to metal atom ratio (D/M) of 0.26. After deuteration, the sample becomes a fine powder and remains single-phase. A Rietveld structural refinement of powder x-ray and neutron diffraction data was made to determine the location of the interstitial sites. For the fully deuterated sample the deuterium atoms sit at both octahedral and tetrahedral sites. the octahedral sites are formed by six Ti atoms in the first and second shells of the icosahedra. Deuterium atoms are also located at the tetrahedral interstitial sites formed between the clusters along <100> directions. in the partially loaded samples with DiM = 0.11, the deuterium atoms occupy only octahedral sites, demonstrating a preference for these sites.
Similar content being viewed by others
References
W. J. Kim, P. C. Gibbons, K. F. Kelton, W. B. Yelon, Phys. Rev., B 58, p. 2578 (1998).
J. L. Libbert, A. L. Goldman, W. B. Yelon, and K. F. Kelton, Phys. Rev. B 49, p. 11675 (1994).
J. H. Harris, W. A. Curtin and M. A. Tenhover, Phys. Rev. B 36, p. 5784 (1987).
K. Samwer, and W. L. Johnson, Phys, Rev. B 28, p. 2907 (1983).
J. Rush, J. M. Rowe, and A. J. Maeland, J. Phys. F. 10, L283 (1980).
M. A. Pick, S. M. Shapiro, and A. M. Stoneham, J. Phys. F. 16, p. 961 (1986).
S. M. Bennigton, I. J. McColm, D. K. Ross, J. Less-Comm. Met. 172, p. 307 (1991).
J. Y. Kim, P. C. Gibbons, K. F. Kelton, J. Alloys and Comp., 266, p. 311 (1998).
H. M. Rietveld, J. Appl. Cryst. 2, p. 65 (1969).
A. C. Larson, and R. B. Von Dreele, Los Alamos National Lab., LAUR 86-748 (1994).
A. C. Switendick, Z. Phys, Chem. N.F 117, p. 89 (1979).
Z. Hu, and W. B. Yelon, J. Appl. Phys. 80, p. 6175 (1996).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kim, J.Y., Kim, W.J., Yelon, W.B. et al. Hydrogen Sites in the α(TiCrSiO) 1/1 Approximant Phase. MRS Online Proceedings Library 553, 135–140 (1998). https://doi.org/10.1557/PROC-553-135
Published:
Issue Date:
DOI: https://doi.org/10.1557/PROC-553-135