Apatite-Type Materials without Interstitial Oxygens Show High Oxide-Ion Conductivity by Overbonding

Professors Yashima and Fujii, and colleages at Tokyo Institute of Technology; Nagoya Institute of Technology; National Institute of Technology, Niihama College; Neutron Science and Technology Center, The Comprehensive Research Organization for Science and Society (CROSS); and Japan Atomic Energy Agency have shown the overbonding of channel oxygens in La-rich apatite-type lanthanum silicates, rather than the presence of the interstitial oxygens, to be responsible for the high oxide-ion conductivity. This concept of "high oxide-ion conductivity by overbonding" opens the door for designing better ion conductors, which could be useful in energy conversion and environmental protection.

• Tokyo Tech News : Apatite-Type Materials without Interstitial Oxygens Show High Oxide-Ion Conductivity by Overbonding
• Yashima Lab