Journal
JOURNAL OF APPLIED PHYSICS
Volume 113, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4788982
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- Alexander von Humboldt foundation
- DFG (Deutsche Forschungsgemeinschaft)
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Ternary single crystalline bixbyite PrxY2-xO3 films over the full stoichiometry range (x = 0-2) have been epitaxially grown on Si (111) with tailored electronic and crystallographic structure. In this work, we present a detailed study of their local atomic environment by extended X-ray absorption fine structure at both Y K and Pr L-III edges, in combination with complementary high resolution x-ray diffraction measurements. The local structure exhibits systematic variations as a function of the film composition. The cation coordination in the second and third coordination shells changes with composition and is equal to the average concentration, implying that the PrxY2-xO3 films are indeed fully mixed and have a local bixbyite structure with random atomic-scale ordering. A clear deviation from the virtual crystal approximation for the cation-oxygen bond lengths is detected. This demonstrates that the observed Vegard's law for the lattice variation as a function of composition is based microscopically on a more complex scheme related to local structural distortions which accommodate the different cation-oxygen bond lengths. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4788982]
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