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

研究成果: Article査読

41 被引用数 (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.

ジャーナルNature communications
出版ステータスPublished - 2015 5 12

ASJC Scopus subject areas

  • 化学 (全般)
  • 生化学、遺伝学、分子生物学(全般)
  • 物理学および天文学(全般)


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