Evidence of Disordered Substitutions in the “Th₂Ni₁₇-type” Structure. Exact Structure Determination of the ThNi, YNi and ErCo Compounds
Hexagonal intermetallic compounds close to R2M17 stoichiometry in the ThNi, YNi and ErCo systems have been studied by single crystal X-ray techniques. All of these compounds have been previously reported as belonging to the Th2Ni17-type structure. In fact, this structure type does not exist but is an ideal case. The nature of the observed extinctions and refinement of the crystal structures show that substitutions must occur on all R rows parallel to the c-axis with the subsequent displacements of the M atoms. This leads to a non-stoichiometric composition, e.g., ThNi9.5. © 1972.
D. Givord et al., "Evidence of Disordered Substitutions in the “Th₂Ni₁₇-type” Structure. Exact Structure Determination of the ThNi, YNi and ErCo Compounds," Journal of The Less-Common Metals, Elsevier, Jan 1972.
The definitive version is available at http://dx.doi.org/10.1016/0022-5088(72)90202-0
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© 1972 Elsevier, All rights reserved.