Nd and Ce simultaneous substitution driven structure modifications in Gd2−xNdxZr2−yCeyO7

Structure and performance evolution of the system (Gd1−Nd )2(Zr1−Ce )2O7 (0 ≤x, y≤ 1.0)

“…Combined with the lattice parameters (shown in Table 2), it is in accordance with our previous results that samples with 1.46 ≤ r A /r B ≤ 1.78 adopt ordered pyrochlore structure, while samples with r A /r B < 1.46 exhibit fluorite structure [25]. Moreover, the lattice parameters increase corresponding to both A and B site substitution, and more obvious increase occurs in B site substitution.…”

“…In our previous work, the feasibility of co-substitution in Gd 2 Zr 2 O 7 has been confirmed by supposing Nd as a surrogate of trivalent actinides, while Ce as the succedaneum of tetravalent actinides [25]. In the present work, we will extend the study to the structure and performance evolution of Nd and Ce co-doped Gd 2 Zr 2 O 7 .…”

“…However, the gradual changing course and the characteristics for XRD and Raman could be helpful to explain it. According to our previous work [25], the phase transition from pyrochlore to fluorite is a gradual course which is driven by the substitution content at both sites. Thus, it is likely to be residual structure of pyrochlore while the bulk has transformed to fluorite structure in Gd 2 Ce 2 O 7 and Nd 2 Ce 2 O 7 .…”

“…1 [25,29,30], it could be concluded that all the (Gd 1−x Nd x ) 2 (Zr 1−y Ce y ) 2 y ≤ 1.0) compounds exhibit a single phase. The original matrix (Gd 2 Zr 2 O 7 ) exhibits pyrochlore structure, which is characterized by the presence of typical super-lattice peaks at 2θ values of about 14 • (1 1 1), 28 • (3 1 1), 37 • (3 3 1) and 45 • (5 1 1) [31].…”

Structural evolution of Lu2‐xCexTi2O7 pyrochlores under 400 keV Ne irradiation

“…18,19 As a promising matrix for the disposal of actinides, such as plutonium from dismantled nuclear weapons, and minor actinides (Am, Np and Cm) from reprocessing of spent nuclear fuel, 20 the pyrochlore structure-type is well known to show a range of responses to irradiation. 4 To investigate the stability and response to radiation of actinide-bearing pyrochlore, cerium has been used as a non-radioactive surrogate of plutonium in A 2 B 2 O 7 in both experimental 21,22 and theoretical [23][24][25] studies.…”