Abstract
This paper is concerned with intermetallic compounds between the A elements thorium, uranium, and plutonium and X elements from the chromium group through the Si group. Thorium, U, and Pu differ from the transition elements in the crystal structure of their com pounds, in that Th, U, and Pu form compounds with definite stoichiometric ratios and never form sigma phases or other compounds which are characterized by variable composition. Furthermore, the thoride elements tend to form compounds with an average atomic volume greater than that predicted from the atomic volumes of the elements, while transition elements generally form compounds which show a contraction in the average atomic volume.
Thoride-rich compounds crystallize in uncommon crystal structures, but thoride-poor compounds have structures which are commonly found in transition element compounds.
Crystal structure data are presented for: U2RhNi, NaT1-type, a0 = 6.419 Ǻ and five isostructural compounds; ThRhA1, Fe2P-type, a0 = 7.183 Ǻ, c0 = 4.120 Ǻ and 28 isostructural compounds; and UCo3, PuNi3-type, a0 = 4.849 Ǻ, c0 = 24.317 Ǻ.
Thoride-rich compounds with nickel exhibit larger average atomic volumes than those with cobalt. The relation of this anomalous behavior to similar observations on titanium compounds is discussed.
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Dwight, A.E. (1969). Alloy Chemistry of Thorium, Uranium, and Plutonium Compounds. In: Giessen, B.C. (eds) Developments in the Structural Chemistry of Alloy Phases. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-5564-7_7
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DOI: https://doi.org/10.1007/978-1-4899-5564-7_7
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