| abstract |
It has a large hydrogen content, hardly contains an impurity phase, and provides a complex oxide suitable for proton conductivity. Complex oxide is of formula Li 7 - a x H x La 3 M 2 O 12 (M is Zr and / or Hf, 3.2 <x≤7) single phase of garnet-type structure belongs to, cubic system is represented by. The manufacturing method of this complex oxide is a raw material complex oxide represented by the formula Li 7 - x H x La 3 M 2 O 12 (M is Zr and/or Hf, 0≦ x ≦3.2), and a compound having a hydroxy group or a carboxyl group. And exchange step of exchanging at least part of lithium in the raw material composite oxide with hydrogen of a compound having a hydroxy group or a carboxyl group. |