The fluorite related modulated structures of the Gd2(Zr2−xCex)O7 solid solution: An analogue for Pu disposition

Morphology of oxide particles in ODS austenitic stainless steel

“…The unit cell edge of pyrochlore is doubled (2 Â 2 Â 2) by ordering of the A-and B-site cations on the fluorite lattice [8][9][10]. A characteristic feature of pyrochlore in selected area diffraction (SAD) patterns is the presence of 1/2 {1 1 1} F type satellite reflections, which arise from the correlated {1 1 1} ordering of metal ion and oxygen vacancies [10,12]. The ''F'' subscript represents the parent fluorite reflection.…”

Influence of Lubricants and Attrition Milling Parameters on the Quality of Zirconolite Ceramics, Consolidated by Hot Isostatic Pressing, for Immobilization of Plutonium

“…Following the notation convention employed by Bianconi, the consensus is that these two features, labeled A and B in Fig. , are due to transition from an initial 2p 6 4f 0 5d 0 state to: (a) the 2p 5 4f 0 5d 1 final state; and (b) the 2p 5 4f 1 5d 1 L 1 final state (where L n denotes a ligand hole) . Other more subtle features are also observed.…”

“…Other more subtle features are also observed. Feature C is considered to be associated with transition to a 2p 5 4f 2 5d 1 L 2 final state; whereas, the weak feature D is assigned to quadrupole transitions …”

Anti-site disorder and physical properties in microwave synthesized RE2Ti2O7 (RE = Gd, Ho) pyrochlores

“…8,9 Rare-Earth (RE) titanate pyrochlores have the general formula RE 2 Ti 2 O 7 , where the crystal structure may be regarded a RE 3+ positions: r( VIII Gd 3+ ) = 1.053 Å, r( VIII Ho 3+ ) = 1.015 Å and r( VI Ti 4+ ) = 0.605 Å. 1-7 Furthermore, due to their high chemical stability and flexibility to form solid solutions with many cations, pyrochlores have been proposed as a host matrix for immobilizing toxic nuclear waste.…”