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REScO 3 Substrates—Purveyors of Strain Engineering
Author(s) -
Klimm Detlef,
Guguschev Christo,
Ganschow Steffen,
Bickermann Matthias,
Schlom Darrell G.
Publication year - 2020
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201900111
Subject(s) - metastability , epitaxy , materials science , strain engineering , lattice (music) , substrate (aquarium) , gibbs free energy , oxide , chemical stability , chemical physics , perovskite (structure) , elastic energy , nanotechnology , crystallography , optoelectronics , thermodynamics , chemistry , metallurgy , geology , physics , oceanography , organic chemistry , layer (electronics) , silicon , acoustics
The thermodynamic and crystallographic background for the development of substrate crystals that are suitable for the epitaxial deposition of biaxially strained functional perovskite layers is reviewed. In such strained layers the elastic energy delivers an additional contribution to the Gibbs free energy, which allows the tuning of physical properties and phase transition temperatures to desired values. For some oxide systems metastable phases can even be accessed. Rare‐earth scandates, REScO 3 , are well suited as substrate crystals because they combine mechanical and chemical stability in the epitaxy process with an adjustable range of pseudo‐cubic lattice parameters in the 3.95 to 4.02 Å range. To further tune the lattice parameters, chemical substitution for the RE or Sc is possible.