Synthesis and structure analysis of a new titanium oxide having an intergrowth structure between ramsdellite-type and calcium ferrite-type

Mikito Mamiya, Kunimitsu Kataoka, Shu Kikuchi, Yuka Terajima, Kazuyasu Tokiwa, Junji Akimoto

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A new crystal phase of Li xTiO 2 is synthesized by Sodium/Lithium ion exchange from high-pressure synthesized CaFe 2O 4-type Na xTiO 2. The crystal structure is analyzed by single crystal X-ray diffraction data and refined to the conventional value of R=9.61% for 812 independent observed reflections. The crystal data of the Li xTiO 2 are as follows; the crystal system is orthorhombic, the space group is Pnam and the lattice parameters are a=17.513(25), b=10.651(7) and c=2.962(3) Å. The crystal has an intergrowth structure between ramsdellite-type and calcium ferrite (CaFe 2O 4)-type, alternatively. The electrochemical property shows the initial Li intercalation capacity is 219 mA h g -1 and the corresponding energy density is 384 W h kg -1. The capacity is maintained after 20 cycles of charge-discharge reaction.

Original languageEnglish
Pages (from-to)1460-1462
Number of pages3
JournalJournal of Physics and Chemistry of Solids
Issue number12
Publication statusPublished - 1 Dec 2012


  • A. Oxides
  • B. Chemical synthesis
  • C. High pressure
  • D. Crystal structure
  • D. Electrochemical properties

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