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Journal articles
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.
Cited literature [15 references]
https://hal-cea.archives-ouvertes.fr/hal-01489339
Contributor : Dominique Girard <>
Submitted on : Wednesday, September 14, 2016 - 3:08:13 PM
Last modification on : Wednesday, July 8, 2020 - 12:43:57 PM
Document(s) archivé(s) le : Thursday, December 15, 2016 - 3:00:20 PM
Contributor : Dominique Girard <>
Submitted on : Wednesday, September 14, 2016 - 3:08:13 PM
Last modification on : Wednesday, July 8, 2020 - 12:43:57 PM
Document(s) archivé(s) le : Thursday, December 15, 2016 - 3:00:20 PM
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