The results of a collaborative research group by Professor Masatomo Yashima at Tokyo Institute of Technology, were published paper in Nature Communications. See below for details.

[Details] Tokyo Institute of Technology
https://www.titech.ac.jp/news/2020/046483.html

Journal name　Nature Communications

Information
＜Title＞ Oxide-Ion Conduction in the Dion-Jacobson Phase CsBi2Ti2NbO10−δ
＜Authors＞ Wenrui Zhang、Kotaro Fujii、Eiki Niwa、Masato Hagihala、Takashi Kamiyama、Masatomo Yashima
＜Journal name＞ Nature Communications
＜DOI＞ https://doi.org/10.1038/s41467-020-15043-z