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Article: Effects of Ionic Radius on Phase Evolution in Ln-Al Co-Doped Ca1-xLnxZrTi2-xAlxO7 (Ln = La, Nd, Gd, Ho, Yb) Solid Solutions

TitleEffects of Ionic Radius on Phase Evolution in Ln-Al Co-Doped Ca1-xLnxZrTi2-xAlxO7 (Ln = La, Nd, Gd, Ho, Yb) Solid Solutions
Authors
KeywordsLattice parameters
Phase evolution
Zirconolite-2M
Zirconolite-3O
Issue Date2018
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ceramint
Citation
Ceramics International, 2018, v. 44 n. 13, p. 15124-15132 How to Cite?
AbstractZirconolite 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.
Persistent Identifierhttp://hdl.handle.net/10722/261608
ISSN
2023 Impact Factor: 5.1
2023 SCImago Journal Rankings: 0.938
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorMa, S-
dc.contributor.authorJi, S-
dc.contributor.authorLiao, C-
dc.contributor.authorLiu, C-
dc.contributor.authorShih, K-
dc.contributor.authorWei, H-
dc.date.accessioned2018-09-28T04:44:37Z-
dc.date.available2018-09-28T04:44:37Z-
dc.date.issued2018-
dc.identifier.citationCeramics International, 2018, v. 44 n. 13, p. 15124-15132-
dc.identifier.issn0272-8842-
dc.identifier.urihttp://hdl.handle.net/10722/261608-
dc.description.abstractZirconolite 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.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ceramint-
dc.relation.ispartofCeramics International-
dc.subjectLattice parameters-
dc.subjectPhase evolution-
dc.subjectZirconolite-2M-
dc.subjectZirconolite-3O-
dc.titleEffects of Ionic Radius on Phase Evolution in Ln-Al Co-Doped Ca1-xLnxZrTi2-xAlxO7 (Ln = La, Nd, Gd, Ho, Yb) Solid Solutions-
dc.typeArticle-
dc.identifier.emailLiao, C: liaocz29@connect.hku.hk-
dc.identifier.emailShih, K: kshih@hku.hk-
dc.identifier.authorityShih, K=rp00167-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ceramint.2018.05.149-
dc.identifier.scopuseid_2-s2.0-85047520662-
dc.identifier.hkuros292713-
dc.identifier.hkuros293275-
dc.identifier.volume44-
dc.identifier.issue13-
dc.identifier.spage15124-
dc.identifier.epage15132-
dc.identifier.isiWOS:000442057800024-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl0272-8842-

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