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REScO3 Substrates—Purveyors of Strain Engineering
Crystal Research and Technology ( IF 1.169 ) Pub Date : 2019-09-18 , DOI: 10.1002/crat.201900111
Detlef Klimm; Christo Guguschev; Steffen Ganschow; Matthias Bickermann; Darrell G. Schlom

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, REScO3, 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.
更新日期:2020-02-12

 

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