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Diffusion Across M/Pb(Zr,Ti)O 3 Interfaces (M=Pt 3 Pb or Pt) Under Different System Conditions
Author(s) -
Lin FangYin,
Chernatynskiy Aleksandr,
Nikkel Jason,
Bulanadi Ralph,
Jones Jacob L.,
Nino Juan C.,
Sinnott Susan B.
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13966
Subject(s) - materials science , diffusion , tetragonal crystal system , curie temperature , partial pressure , diffusion barrier , analytical chemistry (journal) , phase (matter) , oxygen , condensed matter physics , thermodynamics , chemistry , composite material , ferromagnetism , physics , organic chemistry , layer (electronics) , chromatography
Interfaces between functional ceramics, such as Pb(Zr 0.5 Ti 0.5 )O 3 or PZT , and metal electrodes, such as Pt, are important for many devices. Maintaining an interface that is free of secondary phases is necessary for the efficient transfer of electrons and device function. However, there are instances where unstable transient phases form at the interface due to atomic diffusion, such as Pt 3 Pb. Here, we investigate the migration barriers for the diffusion of Pb across the PZT /Pt and PZT /Pt 3 Pb interfaces using density functional theory ( DFT ) and the climbing image nudge elastic band (c‐ NEB ) method. Our calculation models take into account the influence of atmospheric conditions on Pb diffusion through the preferential stabilization of defects near the interface as a result of changes to the Pb and O chemical potentials. In addition, the PZT structures that are stable above and below the Curie temperature are considered. The migration barriers are predicted to be strongly dependent on atmospheric conditions and the phase of the PZT , tetragonal or cubic. In particular, an inversion of the Pb diffusion direction at the PZT /Pt interface is predicted to take place as the oxygen partial pressure increases. This prediction is confirmed by experimental in situ X‐ray diffraction measurements of a PZT /Pt interface.