Surface atomic and chemical structure of relaxor Sr0.63Ba0.37Nb2O6(001)

Abstract : The surface atomic and chemical structures of a Sr0.63Ba0.37Nb2O6(001) single crystal are studied using the low-energy electron diffraction (LEED) and X-ray photoelectron spectroscopy. Sharp, well-defined LEED patterns are observed, consisting of the superposition of two surface reconstructions, (5 × 5)R26.6° and (5 2 × 2)R45°, probably due to long-range ordering of the alkaline earth metal vacancies in A1 or A2 sites. The Sr/Ba stoichiometry is determined by high-resolution X-ray photoelectron spectroscopy. The Sr 3d core level has 2 components corresponding to the 12- and 15-fold coordinated A1 and A2 sites. The Ba 3d core level has only one component, consistent with the A2 site occupancy. The long-range order of the cation vacancies implies that it is rather the Sr/Ba occupancy of the A2 sites which is responsible for the local random fields at the origin of the relaxor behavior.
Document type :
Journal articles
Complete list of metadatas

Cited literature [15 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/hal-01489339
Contributor : Dominique Girard <>
Submitted on : Wednesday, September 14, 2016 - 3:08:13 PM
Last modification on : Thursday, February 7, 2019 - 4:55:15 PM
Long-term archiving on : Thursday, December 15, 2016 - 3:00:20 PM

File

1.4922773.pdf
Files produced by the author(s)

Identifiers

Citation

J. L. Wang, B. Vilquin, B. Gautier, G. Dezanneau, N. Barrett. Surface atomic and chemical structure of relaxor Sr0.63Ba0.37Nb2O6(001). Applied Physics Letters, American Institute of Physics, 2015, 106, pp.242901. ⟨10.1063/1.4922773⟩. ⟨hal-01489339v2⟩

Share

Metrics

Record views

370

Files downloads

156