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Management of Lead Content for Growth of {001}‐Oriented Lead Magnesium Niobate‐Lead Titanate Thin Films
Author(s) -
Keech Ryan,
Shetty Smitha,
Wang Ke,
TrolierMcKinstry Susan
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.14191
Subject(s) - materials science , lead titanate , perovskite (structure) , pyrochlore , nucleation , thin film , titanate , electrode , deposition (geology) , magnesium , phase (matter) , chemical engineering , ferroelectricity , mineralogy , composite material , nanotechnology , metallurgy , dielectric , optoelectronics , ceramic , chemistry , paleontology , organic chemistry , sediment , biology , engineering
A scalable growth process for domain engineered {001}‐oriented lead magnesium niobate—lead titanate (PMN‐PT) thin films with Lotgering factors of 0.98–1.0, without an orienting perovskite seed layer, is presented. Deposition of a 2–3‐nm‐thick PbO buffer layer on {111} Pt thin film bottom electrodes, prior to chemical solution deposition of PMN‐PT reduces the driving force for Pb diffusion from the PMN‐PT to the bottom electrode, and facilitates nucleation of {001}‐oriented perovskite grains. Energy dispersive spectroscopy demonstrated that up to 10% of the Pb from a PMN‐PT precursor solution may diffuse into the bottom electrode. PMN‐PT grains with a mixed {101}/{111} orientation in a matrix of Pb‐deficient pyrochlore phase were then promoted near the interface. When this is prevented, phase‐pure films with {001} orientation can be achieved.
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