Blas Pedro Uberuaga

1 Introduction Oxide heterointerfaces, in which two dissimilar compounds are brought together in some kind of composite structure, are common both naturally and in human-made applications.

Hydrogen (H) embrittles titanium (Ti) and zirconium (Zr) metals and their alloys [[1], [2], [3]] through the formation of brittle hydride, enhancing the atomic decohesion, accelerating the emission, multiplication, and motion of dislocations [[4], [5], [6], [7]]. The behavior of hydrogen in Ti and Zr based alloys is of fundamental interest and vital importance because these alloys are the key engineering materials for aerospace, marine, and energy resource applications [8,9].

Influence of misfit dislocations on ionic conductivity at oxide interfaces Mismatched complex oxide thin films and heterostructures have gained significant traction for use as electrolytes in intermediate temperature solid oxide fuel cells, wherein interfaces exhibit variation in ionic conductivity as compared to the bulk.