Structural chemistry and magnetic behavior of binary uranium silicides

RETRACTED: First-Principles Study of Advanced Nuclear Materials: Defect Behavior and Fission Products in U-Si System

“…The current results suggest that β-U 3 Si are more favorable to be formed than γ-U 3 Si. It agrees with the facts that the transition temperature between these phases of U 3 Si is as high as 762~780 ℃ [2] and that β-U 3 Si can be stable at low temperatures. Table 2 also shows that both α-USi 2 and β-USi 2 have high negative formation energies, consistent with the fact that those two compound can be synthesized at low temperature (below 450 ℃).…”

“…To properly and safely utilize this advanced nuclear fuel, it is crucial to understand its bulk properties. U 3 Si have three different phases, the α-U 3 Si (space group Fmmm) phase forms below -153 ℃ [2], the β-U 3 Si (space group I4/mmm) phase forms in the temperature range of -153 to 762 ℃ [3], and β-U 3 Si will transform into γ-U 3 Si (space group Pm3m) which has Cu 3 Au type structure at temperatures above 780 ℃ [4]. The tetragonal α-USi 2 is of the ThSi 2 type (space group I4 1 /amd) and this compound is metastable at moderate temperatures (< 450 ℃).…”

Ternary Rare Earth Metal Gold Stannides and Indides with Ordered U3Si2 and Zr3Al2-Type Structure

“…The isotypism of Dy2Au2In with U 2R h2Sn [5] and U 3Si2 [3,4] was already recognized from the Guinier powder pattern. In contrast to E r2Au2Sn and the indides Tm2Au2In and Lu2Au2In, the pow der pattern did not show any additional reflections 0932-0776/94/1100-1525 $06.00 © 1994 Verlag der Zeitschrift für Naturforschung.…”

“…In the present paper, we report on the synthesis of G d2Au2Sn, Tb2Au2Sn and the in dides R E 2A u2In (R E = Y, G d -T m , Lu). While Tm 2A u2In and Lu2Au2In also crystallize in the or dered Z r3A l2-type, all other compounds adopt the ordered U 3Si2-type structure [3,4]. Isotypic com pounds with uranium have been reported recently: U 2T 2Sn (T = Fe, Co, Ni, Ru, Rh, Pd, Pt) and U 2T 2In (T = Co, Ni, Rh, Pd, Ir, Pt) [5][6][7][8][9],…”

Ca2Pd2Cd with W2B2Co-type Structure

“…The Mo 2 B 2 Fe-type structure [1], a ternary ordered version of U 3 Si 2 [2,3], has more than 200 representatives for element combinations RE 2 T 2 X (RE = rare earth element, T = transition metal; X = Mg, Zn, Cd, In, Sn, Pb) [4]. Since T elements from the Fe, Co, Ni, and Cu group can be used and the X component can be a di-, tri-or tetravalent element, significant variations of the valence electron concentration (VEC) are possible, leading to a broad variety of magnetic and electric properties in this family of compounds [4].…”