Effects of High Li Content on the Crystal Structure and Properties of Li2+xTiO3 Ceramic Pebbles by Sol-Gel Method
Tóm tắt
Lithium titanate is one of the most promising candidates among advanced tritium breeders for fusion reactors. However, the tritium breeding ratio (TBR) of Li2TiO3 is smaller than that of Li2O or Li8TiO6, etc., due to its lower Li density. Therefore, new Li-containing ceramics with both high stability and high Li density need to be further explored. In this work, the Li2+xTiO3 powder with high Li content was prepared by the sol-gel method, and the pebbles were fabricated by a wet forming process. The effect of excess lithium on the crystal structure and performance of Li2+xTiO3 were systematically investigated. The synthesis temperature of Li2+xTiO3 powder with a well-developed crystal structure prepared by this method was 500 °C, and all the diffraction patterns of sintered Li2+xTiO3(x = 0–0.4) powder were the same as those of β-Li2TiO3 phase and no second phase peaks are observed. These results demonstrated that Li2+xTiO3 powder was a solid solution with high Li content. The particle size distribution of Li2+xTiO3 powder was about 40–90 nm. As x = 0.3, the Li content is stable both in Li2+xTiO3 powder and pebbles, and the Li2.3TiO3 pebbles presented a very high relative density of 87%, a small grain size of 1.8 μm, and good sphericity of 0.98, respectively. Especially, the crushing load reached 50 N. Thus, the Li2.3TiO3 solid solution pebble is an important candidate breeder material for advanced tritium breeders.Kindly check and confirm street information is correctly identified for Affiliation 1.The street information is correctly identified for Affiliation 1.We are very grateful for your additions.
Tài liệu tham khảo
R. Knitter, P. Chaudhuri, Y.J. Feng, T. Hoshino, I.K. Yu, Recent developments of solid breeder fabrication. J. Nucl. Mater. 442(1–3), S420–S424 (2013)
J.G. van der Laan, H. Kawamura, N. Roux, D. Yamaki, Ceramic breeder research and development: progress and focus. J. Nucl. Mater. 283, 99–109 (2000)
K. Tsuchiya, H. Kawamura, K. Fuchinoue, H. Sawada, K. Watarumi, Fabrication development and preliminary characterization of Li2TiO3 pebbles by wet process. J. Nucl. Mater. 258, 1985–1990 (1998)
J.M. Miller, H.B. Hamilton, J.D. Sullivan, Testing of lithium titanate as an alternate blanket material. J. Nucl. Mater. 212–215, 877–880 (1994)
J.P. Kopasz, J.M. Miller, C.E. Johnson, Tritium release from lithium titanate, a low-activation tritium breeding material. J. Nucl. Mater. 212–215, 927–931 (1994)
T. Hoshino, M. Dokiya, T. Terai, Y. Takahashi, M. Yamawaki, Non-stoichiometry and its effect on thermal properties of Li2TiO3. Fusion Eng. Des. 61–62, 353–360 (2002)
T. Hoshino, K. Kato, Y. Natori, M. Nakamura, K. Sasaki, K. Hayashi, T. Terai, K. Tatenuma, New synthesis method of advanced lithium titanate with Li4TiO4 additives for ITER-TBM. Fusion Eng. Des. 84(2–6), 956–959 (2009)
T. Hoshino, K. Kato, Y. Natori, F. Oikawa, N. Nakano, M. Nakamura, K. Sasaki, A. Suzuki, T. Terai, K. Tatenuma, Development of advanced tritium breeding material with added lithium for ITER-TBM. J. Nucl. Mater. 417(1–3), 684–687 (2011)
M. Hong, Y. Zhang, Y. Mi, M. Xiang, Y. Zhang, Fabrication and characterization of Li2TiO3 core-shell pebbles with enhanced lithium density. J. Nucl. Mater. 445(1–3), 111–116 (2014)
M. Xiang, Y. Zhang, Y. Zhang, S. Liu, H. Liu, C. Wang, Fabrication and characterization of Li2TiO3-Li4SiO4 pebbles for tritium breeder. J. Fusion Energ. 34(6), 1341–1347 (2015)
M. Xiang, Y. Zhang, Y. Zhang, S. Liu, H. Liu, C. Wang, C. Gu, Preparation of Li2TiO3-Li4SiO4 core-shell ceramic pebbles with enhanced crush load by graphite bed process. J. Nucl. Mater. 466, 477–483 (2015)
G.J. Rao, R. Mazumder, S. Bhattacharyya, P. Chaudhuri, Fabrication and characterization of Li4SiO4-Li2TiO3 composite ceramic pebbles using extrusion and spherodization technique. J. Eur. Ceram. Soc. 38(15), 5174–5183 (2018)
D.A.H. Hanaor, M.H.H. Kolb, Y. Gan, M. Kamlah, R. Knitter, Solution based synthesis of mixed-phase materials in the Li2TiO3-Li4SiO4 system. J. Nucl. Mater. 456, 151–161 (2015)
K. Katayama, H. Sakagawa, T. Hoshino, S. Fukada, Evaluation of Li mass loss from Li2TiO3 with excess Li pebbles in water vapor atmosphere. Fusion Eng. Des. 136, 362–366 (2018)
T. Hoshino, M. Yasumoto, K. Tsuchiya, K. Hayashi, H. Nishimura, A. Suzuki, T. Terai, Non-stoichiometory and vaporization characteristic of Li2.1TiO3.05 in hydrogen atmosphere. Fusion Eng. Des. 82(15–24), 2269–2273 (2007)
T. Hoshino, Optimization of sintering conditions of advanced tritium breeder pebbles fabricated by the emulsion method. Fusion Eng. Des. 98–99, 1788–1791 (2015)
K. Katayama, A. Ipponsugi, T. Hoshino, Influence of lithium mass transfer on tritium behavior in pebbles of Li2TiO3 with excess lithium. Fusion Eng. Des. 161, 112011 (2020)
J.S. Kim, C.S. Johnson, M.M. Thackeray, Layered xLiMO(2) center dot (1–x)Li2M ’ O-3 electrodes for lithium batteries: a study of 095LiMn(0.5)Ni(0.5)O(2) center dot 0.05Li(2)TiO(3). Electrochem. Commun. 4(3), 205–209 (2002)
A. Gupta, S. Pal, S. Uma, Systematic color variation across the solid solution members, Li2Mn1-xTixO3 (0.0 <= x <= 1.0). J. Phys. Chem. Solids 134, 238–244 (2019)
G. Izquierdo, A.R. West, Phase equilibria in the system Li2O-TiO2. Mater. Res. Bull. 15(11), 1655–1660 (1980)
J.C. Mikkelsen Jr., Pseudobinary phase relations of Li2Ti3O7. J. Am. Ceram. Soc. 63(5–6), 331–335 (1980)
H. Kleykamp, Phase equilibria in the Li-Ti-O system and physical properties of Li2TiO3. Fusion Eng. Des. 61–62, 361–366 (2002)
S. Claus, H. Kleykamp, W. Smykatz-Kloss, Phase equilibria in the Li4SiO4-Li2SiO3 region of the pseudobinary Li2O-SiO2 system. J. Nucl. Mater. 230(1), 8–11 (1996)
C.-L. Yu, D.-P. Gao, K. Yanagisawa, Vacancy and substitution defects of β-Li2TiO3 prepared by hydrothermal method. Chem. Lett. 43(3), 369–370 (2014)
X. Hu, G. Tan, L. Cai, S. Song, W. Wu, B. Feng, Z. Qin, R. Liu, Z. Shen, Y. Zhang, A novel process for fully automatic mass-production of Li2TiO3 ceramic pebbles with uniform structure and size. Ceram. Int. 48(5), 6393–6401 (2022)
H. Wedemeyer, H. Werle, E. Günther, Influence of grain-size and carbonate impurities on the tritium release from lithium orthosilicate. J. Nucl. Mater. 191–194, 240–242 (1992)
T. Hanada, M. Nishikawa, T. Kanazawa, H. Yamasaki, N. Yamashita, S. Fukada, Effect of surface water on tritium release behavior from Li2TiO3. J. Nucl. Mater. 417(1), 735–738 (2011)
G. Ackland, Controlling radiation damage. Science 327(5973), 1587–1588 (2010)