Oxyhydrides of (Ca,Sr,Ba)TiO3 perovskite solid solutions

Tatsunori Sakaguchi, Yoji Kobayashi, Takeshi Yajima, Masatoshi Ohkura, Cédric Tassel, Fumitaka Takeiri, Shingo Mitsuoka, Hiroshi Ohkubo, Takafumi Yamamoto, Jung Eun Kim, Naruki Tsuji, Akihiko Fujihara, Yoshitaka Matsushita, James Hester, Maxim Avdeev, Kenji Ohoyama, Hiroshi Kageyama

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49 Citations (Scopus)

Abstract

The oxyhydride solid solutions (Ca,Sr)TiO3-xHx and (Sr,Ba)TiO3-xHx have been prepared by reducing the corresponding ATiO3 oxides with calcium hydride. Under the reaction conditions examined, a hydride content of x = 0.1-0.3 was obtained for all compositions. Compared to our previous result with BaTiO3-xH x, the larger particle size in this study (20-30 μm vs 170 nm) resulted in a somewhat lower hydride amount despite prolonged reaction times. We examined changes in cell volume, octahedral tilt angle, and site occupancy of different anion sites after conversion to oxyhydrides; it appears that these oxyhydrides fit the geometrical descriptions typical for regular ABO3 perovskites quite well. The hydrogen release temperature, previously shown to be indicative of the hydride exchange temperature, however, does not scale linearly with the A-site composition, indicating a potential effect of chemical randomness.

Original languageEnglish
Pages (from-to)11371-11376
Number of pages6
JournalInorganic chemistry
Volume51
Issue number21
DOIs
Publication statusPublished - 2012 Nov 5

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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    Sakaguchi, T., Kobayashi, Y., Yajima, T., Ohkura, M., Tassel, C., Takeiri, F., Mitsuoka, S., Ohkubo, H., Yamamoto, T., Kim, J. E., Tsuji, N., Fujihara, A., Matsushita, Y., Hester, J., Avdeev, M., Ohoyama, K., & Kageyama, H. (2012). Oxyhydrides of (Ca,Sr,Ba)TiO3 perovskite solid solutions. Inorganic chemistry, 51(21), 11371-11376. https://doi.org/10.1021/ic300859n