External stimulation-controllable heat-storage ceramics

Hiroko Tokoro, Marie Yoshikiyo, Kenta Imoto, Asuka Namai, Tomomichi Nasu, Kosuke Nakagawa, Noriaki Ozaki, Fumiyoshi Hakoe, Kenji Tanaka, Kouji Chiba, Rie Makiura, Kosmas Prassides, Shin Ichi Ohkoshi

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


Commonly available heat-storage materials cannot usually store the energy for a prolonged period. If a solid material could conserve the accumulated thermal energy, then its heat-storage application potential is considerably widened. Here we report a phase transition material that can conserve the latent heat energy in a wide temperature range, T<530K and release the heat energy on the application of pressure. This material is stripe-type lambda-trititanium pentoxide, λ -Ti3O5, which exhibits a solid-solid phase transition to beta-trititanium pentoxide, β-Ti3O5. The pressure for conversion is extremely small, only 600bar (60MPa) at ambient temperature, and the accumulated heat energy is surprisingly large (230kJL-1). Conversely, the pressure-produced beta-trititanium pentoxide transforms to lambda-trititanium pentoxide by heat, light or electric current. That is, the present system exhibits pressure-and-heat, pressure-and-light and pressure-and-current reversible phase transitions. The material may be useful for heat storage, as well as in sensor and switching memory device applications.

Original languageEnglish
Article number7037
JournalNature communications
Publication statusPublished - 2015 May 12

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)


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