Data Base
for Tritium Solid Breeding Materials
(Li₂O, Li₂TiO₃, Li₂ZrO₃ and Li₄SiO₄)
of Fusion Reactor Blankets

　Great interest is developing in thermonuclear fusion reactors that are widely recognized as one of the most promising non-fossil energy sources in the next generation and following unnumbered centuries. Among a number of problems to be solved for establishing thermonuclear reactors, efficient breeding of tritium in the reactors is one of the most important requirements for their economical feasibility.

  At present, ceramic materials containing Li as Li₂O, Li₂TiO₂, Li₂ZrO₃, Li₄SiO₄ and so on are considered to be most preferable blanket materials for the tritium-breeding in thermonuclear reactors. For some of the materials, their characteristic properties to design a blanket are accumulated and understood rather well, but for the others the understanding is still not enough because of the lack of data themselves, accuracy and/or reliability. On account of such situation, the authors have extensively searched through a large number of literature and papers to gather materials data indispensable for designing a blanket of fusion reactor. Their effort has been published in separate papers of Annual Report of Hydrogen Isotope Research Center, but it is apparently much better that those data are compiled to a single article. Then the authors have made further effort to rearrange the data for compiling them into a data book. This book is now published as a special issue of Annual Report of Hydrogen Isotope Research Center.

  This data book contains the materials data for Li₂O, Li₂TiO₂, Li₂ZrO₃ and Li₄SiO₄ and the data are presented in matrix form for the sake of easy search for required data and to demonstrate the present status of data accumulation. On looking at pages, readers could easily find desired materials data or sees the lack of them in the tables and/or figures, suggesting further extensive investigation to design efficient blanket systems.

  On behalf of editorial board, it is my great pleasure to express our thanks and congratulations for the authors to publish this data book. I have no doubt in regard to the validity and usefulness of this book, since examination of blanket systems and further development are one of the most important issues of the ITER project.

  Readers of this book might be noticed that the quality of tables and figures is greatly refined from those appeared in the previous papers. Most of the tables and figures appeared in these papers are beautifully rewritten and/or redrawn for this book. Many thanks for the refinement are due to Ms. Nishida.

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  This up-to-date compilation of data is to construct the database for Li₂O, Li₂TiO₃, Li₂ZrO₃ and Li₄SiO₄ of fusion reactor blankets and to make it clear on what properties of some materials there are no information, uncertainties, few information, and good agreements. As a result of this compilation, the present status of existing data can be recognized for these breeding materials.
  These data have been collected from as many sources as possible. This database includes data for physical and thermal properties, mechanical properties, chemical stability and compatibility, tritium solubility and transport, irradiation effects, afterheat characteristics, thermal cycling effects, waste disposal, and miscellaneous properties of ceramic breeding materials, such as Li₂O, Li₂TiO₃, Li₂ZrO₃ and Li₄SiO₄.
  In addition, the data are arranged in a matrix form, so as to be easily used, and the matrix form makes it clear whether any data are good or limited and uncertain.
  This database is expected to be very useful and helpful for designing and evaluating the breeding blanket.

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Index