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- W2804337873 abstract "Zirconolite ceramic has been considered as a promising matrix to dispose high-level radioactive waste due to its excellent performance in immobilizing radionuclides. In this work, a series of zirconate solid solutions with stoichiometric Ca1-xLnxZrTi2-xAlxO7 (Ln = La, Nd, Gd, Ho, Yb; x = 0.1–1) were systematically studied to investigate the radius effect on their phase evolution. Powder X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive X-Ray spectrometry (SEM-EDX) were used to characterize the products. XRD and SEM results show that complete solid solutions of Ln and Al in zirconolite phase for Ca1-xLnxZrTi2-xAlxO7 cannot found. In the Ca1-xLaxZrTi2-xAlxO7 ceramics, single zirconolite phase cannot form, instead of multiple phases, such as zirconolite-2M, zirconia, perovskite and LaTi2Al9O19. In the Nd-Al co-doping ceramics, nearly single zirconolite-2M and zirconolite-3O were found at x ≤ 0.6 and 0.8 ≤ x ≤ 0.9, respectively. The miscibility gap between zirconolite-2M and 3O was found at x = 0.7. Single zirconolite-2M formed in the Gd-Al, Ho-Al and Yb-Al co-doped ceramics can only be detected in a compositional range of 0.1 ≤ x ≤ 0.8. Higher incorporation contents in these three series can form an additional phase cubic zirconia which is usually a ceramic waste form for radionuclides. Based on the XRD data, lattice parameters of zirconolite-2M and zirconolite-3O were calculated by Pawley refinement method. The evolution of lattice parameters of zirconolite-2M shows great difference between different lanthanide ions, indicating different substitution mechanisms in the Ln-Al co-doped zirconolite-2M." @default.
- W2804337873 created "2018-06-01" @default.
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- W2804337873 date "2018-09-01" @default.
- W2804337873 modified "2023-10-18" @default.
- W2804337873 title "Effects of ionic radius on phase evolution in Ln-Al co-doped Ca1-xLnxZrTi2-xAlxO7 (Ln = La, Nd, Gd, Ho, Yb) solid solutions" @default.
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- W2804337873 doi "https://doi.org/10.1016/j.ceramint.2018.05.149" @default.
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