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Reece ME, Li J, Strzelecki AC, Wen J, Zhang Q, Guo X. Surface thermodynamics of yttrium titanate pyrochlore nanomaterials. NANOSCALE 2024; 16:5421-5432. [PMID: 38385242 DOI: 10.1039/d3nr05605h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Nanocrystalline pyrochlore materials have been investigated for their enhanced radiation tolerance as ceramic nuclear waste hosts. In this work, we study the thermodynamic driving force of nano-scale materials for radiation resistance. The size dependent thermodynamic properties of a series of Y2Ti2O7 nanoparticles were investigated. Samples were synthesized by a sol-gel method and characterized by synchrotron X-ray diffraction, BET analysis, and thermogravimetric analysis. The surface and interface enthalpies of Y2Ti2O7 were determined by high temperature oxide melt drop solution calorimetry to be 4.07 J m-2 and 3.04 J m-2, respectively. The experimentally obtained surface energy is in good agreement with computationally derived average surface energies for yttrium and other rare-earth titanate pyrochlores. Theoretical links between nanoparticle stability, surface energy, and radiation resistance of pyrochlore materials were then explored.
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Affiliation(s)
- Margaret E Reece
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA.
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Jiahong Li
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA.
| | - Andrew C Strzelecki
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
- The School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
| | - Juan Wen
- School of Materials and Energy, Lanzhou University, Lanzhou, Gansu 730000, China
| | - Qiang Zhang
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA.
| | - Xiaofeng Guo
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA.
- The School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
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Kadi Allah I, Bekka A, Dinnebier RE, Kameche M, Laouedj N, Touati W, Alaoui C, Bouziani ZEA, Lellou S, Karmaoui M. Structural, optical and electrical study of new polycrystalline Bi1.5-xCexSb1.5CuO7 solid solution fractions with pyrochlore-type structure. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Sun J, Zhou J, Li L, Hu Z, Chan TS, Vitova T, Song S, Liu R, Jing C, Yu H, Zhang M, Rothe J, Wang JQ, Zhang L. Atomic controllable anchoring of uranium into zirconate pyrochlore with ultrahigh loading capacity. Chem Commun (Camb) 2022; 58:3469-3472. [PMID: 35195655 DOI: 10.1039/d2cc00576j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient immobilization of actinide wastes is challenging in the nuclear energy industry. Here, we reported that 100% substitution of Zr4+ by U6+ in a La2Zr2O7 matrix has been achieved for the first time by the molten salt (MS) method. Importantly, we observed that uranium can be precisely anchored into Zr or La sites of the La2Zr2O7 matrix, as confirmed by X-ray diffraction, Raman, and X-ray absorption spectra. This work will guide the construction of site-controlled and high-capacity actinide-immobilized pyrochlore materials and could be extended to other perovskite materials.
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Affiliation(s)
- Jian Sun
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China. .,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Zhou
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
| | - Lili Li
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, Dresden 01187, Germany
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan, Republic of China
| | - Tonya Vitova
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), Karlsruhe 76021, Germany.
| | - Sanzhao Song
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
| | - Renduo Liu
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
| | - Chao Jing
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
| | - Haisheng Yu
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
| | - Ming Zhang
- Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
| | - Joerg Rothe
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), Karlsruhe 76021, Germany.
| | - Jian-Qiang Wang
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China. .,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Linjuan Zhang
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China. .,University of Chinese Academy of Sciences, Beijing 100049, China
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Influence of P and Ti on Phase Formation at Solidification of Synthetic Slag Containing Li, Zr, La, and Ta. MINERALS 2022. [DOI: 10.3390/min12030310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In the future, it will become increasingly important to recover critical elements from waste materials. For many of these elements, purely mechanical processing is not efficient enough. An already established method is pyrometallurgical processing, with which many of the technologically important elements, such as Cu or Co, can be recovered in the metal phase. Ignoble elements, such as Li, are known to be found in the slag. Even relatively base or highly redox-sensitive elements, such as Zr, REEs, or Ta, can be expected to accumulate in the slag. In this manuscript, the methods for determining the phase formation and the incorporation of these elements were developed and optimized, and the obtained results are discussed. For this purpose, oxide slags were synthesized with Al, Si, Ca, and the additives, P and Ti. To this synthetic slag were added the elements, Zr and La (which can be considered proxies for the light REEs), as well as Ta. On the basis of the obtained results, it can be concluded that Ti or P can have strong influences on the phase formation. In the presence of Ti, La, and Ta, predominantly scavenged by perovskite (Ca1-wLa2/3wTi1-(x+y+z)Al4/3xZryTa4/5zO3), and Zr predominantly as zirconate (Ca1-wLa2/3wZr4-(x+y+z)Al4/3xTiyTa4/5zO9), with the P having no effect on this behavior. Without Ti, the Zr and Ta are incorporated into the pyrochlore (La2-xCa3/2x-yZr2+2/4y-zTa4/5zO7), regardless of the presence of phosphorus. In addition to pyrochlore, La accumulates primarily in britholite-type La oxy- or phosphosilicates. Without P and Ti, similar behavior is observed, except that the britholite-like La silicates do not contain P, and the scavenging of La is less efficient. Lithium, on the other hand, forms its own compounds, such as LiAlO2(Si), LiAl5O8, eucryptite, and Li silicate. Additionally, in the presence of P, Li3PO4 is formed, and the eucryptite incorporates P, which indicates an additional P-rich eutectic melt.
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Sun J, Zhou J, Hu Z, Chan TS, Liu R, Yu H, Zhang L, Wang JQ. Controllable sites and high-capacity immobilization of uranium in Nd 2Zr 2O 7 pyrochlore. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:37-44. [PMID: 34985421 PMCID: PMC8733979 DOI: 10.1107/s1600577521012558] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 11/25/2021] [Indexed: 06/14/2023]
Abstract
As potential nuclear waste host matrices, two series of uranium-doped Nd2Zr2O7 nanoparticles were successfully synthesized using an optimized molten salt method in an air atmosphere. Our combined X-ray diffraction, Raman and X-ray absorption fine-structure (XAFS) spectroscopy studies reveal that uranium ions can precisely substitute the Nd site to form an Nd2-xUxZr2O7+δ (0 ≤ x ≤ 0.2) system and the Zr site to form an Nd2Zr2-yUyO7+δ (0 ≤ y ≤ 0.4) system without any impurity phase. With increasing U concentration, there is a phase transition from pyrochlore (Fd3m) to defect fluorite (Fm3m) structures in both series of U-doped Nd2Zr2O7. The XAFS analysis indicates that uranium exists in the form of high-valent U6+ in all samples. To balance the extra charge for substituting Nd3+ or Zr4+ by U6+, additional oxygen is introduced accompanied by a large structural distortion; however, the Nd2Zr1.6U0.4O7+δ sample with high U loading (20 mol%) still maintains a regular fluorite structure, indicating the good solubility of the Nd2Zr2O7 host for uranium. This study is, to the best of our knowledge, the first systematic study on U-incorporated Nd2Zr2O7 synthesized via the molten salt method and provides convincing evidence for the feasibility of accurately immobilizing U at specific sites.
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Affiliation(s)
- Jian Sun
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Jing Zhou
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan
| | - Renduo Liu
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
| | - Haisheng Yu
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
| | - Linjuan Zhang
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Jian-Qiang Wang
- Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
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Farzana R, Zhang Y, Dayal P, Aly Z, Holmes R, Triani G, Vance ER, Gregg DJ. Pyrochlore glass-ceramics for the immobilization of molybdenum-99 production wastes: Demonstrating scalability and flexibility to waste stream variance. Ann Ital Chir 2021. [DOI: 10.1016/j.jeurceramsoc.2021.06.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Tong Z, Gao R, Li X, Guo L, Wang J, Zeng Z, Deng Q, Deng S. Highly Controllable Hydrogenative Ring Rearrangement and Complete Hydrogenation Of Biobased Furfurals over Pd/La
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(B=Ti, Zr, Ce). ChemCatChem 2021. [DOI: 10.1002/cctc.202101063] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Zhikun Tong
- Key Laboratory of Poyang Lake Environment and Resource Utilization Nanchang University) Ministry of Education School of Resource Environmental and Chemical Engineering Nanchang University No. 999 Xuefu Avenue Nanchang 330031 P. R. China
| | - Rui Gao
- Key Laboratory of Poyang Lake Environment and Resource Utilization Nanchang University) Ministry of Education School of Resource Environmental and Chemical Engineering Nanchang University No. 999 Xuefu Avenue Nanchang 330031 P. R. China
| | - Xiang Li
- Key Laboratory of Poyang Lake Environment and Resource Utilization Nanchang University) Ministry of Education School of Resource Environmental and Chemical Engineering Nanchang University No. 999 Xuefu Avenue Nanchang 330031 P. R. China
| | - Lingyun Guo
- Key Laboratory of Poyang Lake Environment and Resource Utilization Nanchang University) Ministry of Education School of Resource Environmental and Chemical Engineering Nanchang University No. 999 Xuefu Avenue Nanchang 330031 P. R. China
| | - Jun Wang
- Key Laboratory of Poyang Lake Environment and Resource Utilization Nanchang University) Ministry of Education School of Resource Environmental and Chemical Engineering Nanchang University No. 999 Xuefu Avenue Nanchang 330031 P. R. China
| | - Zheling Zeng
- Key Laboratory of Poyang Lake Environment and Resource Utilization Nanchang University) Ministry of Education School of Resource Environmental and Chemical Engineering Nanchang University No. 999 Xuefu Avenue Nanchang 330031 P. R. China
| | - Qiang Deng
- Key Laboratory of Poyang Lake Environment and Resource Utilization Nanchang University) Ministry of Education School of Resource Environmental and Chemical Engineering Nanchang University No. 999 Xuefu Avenue Nanchang 330031 P. R. China
| | - Shuguang Deng
- School for Engineering of Matter Transport and Energy Arizona State University 551 E. Tyler Mall Tempe AZ 85287 USA
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Wang L, Li J, Xie H, Chen Q, Xie Y. Solubility, structure transition and chemical durability of Th-doped Nd2Zr2O7 pyrochlore. PROGRESS IN NUCLEAR ENERGY 2021. [DOI: 10.1016/j.pnucene.2021.103774] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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