Optimal migration path of Ag in HfO
2
: A first-principles study
*
Dai Yue-Hua†
a)
, Chen Zhen
a)
, Jin Bo
a)
, Li Ning
a)
, Li Xiao-Feng
b)
Optimal migration paths of Ag in HfO
2
viewed from (a) [010], (b) , (c) [110], and (d) directions.