An oxyhydride of BaTiO3 exhibiting hydride exchange and electronic conductivity

Yoji Kobayashi, Olivier J. Hernandez, Tatsunori Sakaguchi, Takeshi Yajima, Thierry Roisnel, Yoshihiro Tsujimoto, Masaki Morita, Yasuto Noda, Yuuki Mogami, Atsushi Kitada, Masatoshi Ohkura, Saburo Hosokawa, Zhaofei Li, Katsuro Hayashi, Yoshihiro Kusano, Jung Eun Kim, Naruki Tsuji, Akihiko Fujiwara, Yoshitaka Matsushita, Kazuyoshi YoshimuraKiyonori Takegoshi, Masashi Inoue, Mikio Takano, Hiroshi Kageyama

Research output: Contribution to journalArticlepeer-review

228 Citations (Scopus)


In oxides, the substitution of non-oxide anions (F -S 2-N 3- and so on) for oxide introduces many properties, but the least commonly encountered substitution is where the hydride anion (H-) replaces oxygen to form an oxyhydride. Only a handful of oxyhydrides have been reported, mainly with electropositive main group elements or as layered cobalt oxides with unusually low oxidation states. Here, we present an oxyhydride of the perhaps most well-known perovskite, BaTiO3, as an O 2-/H-solid solution with hydride concentrations up to 20% of the anion sites. BaTiO3-x Hx is electronically conducting, and stable in air and water at ambient conditions. Furthermore, the hydride species is exchangeable with hydrogen gas at 400°C. Such an exchange implies diffusion of hydride, and interesting diffusion mechanisms specific to hydrogen may be at play. Moreover, such a labile anion in an oxide framework should be useful in further expanding the mixed-anion chemistry of the solid state.

Original languageEnglish
Pages (from-to)507-511
Number of pages5
JournalNature Materials
Issue number6
Publication statusPublished - Jun 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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