12
T. Onishi
Ba
Li
K
K
K
B a
Ba
Ba
K
Ba
Fig. 1.11 Schematic figure of nanoscale lithium ion-conduction in K x Ba (1–x)/2 MnF 3 perovskite.
(Reprinted by permission from Springer Nature Singapore Pte Ltd., [39], COPYRIGHT (2018).
Potassium and barium are fixed within cube, due to large ionic radius. Lithium ion migrates via
counter cation-vacancy (dotted circle))
4. Hydride Ion-Conduction
Recently hydride ion has attracted much scientific interest, from the viewpoint of
fast ion-conduction. We demonstrated that hydride fluctuation occurs in hydride ionconducting BaTiO 3 perovskite [42]. In Chap. 2, hydride ion-conducting mechanism
in perovskite fluoride and hydride is overviewed.
1.5.1.3 Hydrogen Storage Perovskite
In metal hydrides, perovskite hydrides and related nanomaterials [43–50], hydrogen
storage applicability was experimentally and theoretically investigated. As shown
in Fig. 1.15, hydrogen (hydrogen molecule) is released through the dissociation of
perovskite hydride. In Chap. 2, chemical bonding between magnesium and hydride
ion is explained in KMgH 3 perovskite.