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001     31698
005     20180210130552.0
024 7 _ |2 WOS
|a WOS:000180947500002
037 _ _ |a PreJuSER-31698
041 _ _ |a eng
082 _ _ |a 620
084 _ _ |2 WoS
|a Materials Science, Ceramics
100 1 _ |a Meyer, R.
|b 0
|u FZJ
|0 P:(DE-Juel1)VDB5958
245 _ _ |a Cationic surface segregation in donor-doped SrTiO3 under oxidizing conditions
260 _ _ |a Dordrecht [u.a.]
|b Springer Science + Business Media B.V
|c 2002
300 _ _ |a 101 - 110
336 7 _ |a Journal Article
|0 PUB:(DE-HGF)16
|2 PUB:(DE-HGF)
336 7 _ |a Output Types/Journal article
|2 DataCite
336 7 _ |a Journal Article
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|2 EndNote
336 7 _ |a ARTICLE
|2 BibTeX
336 7 _ |a JOURNAL_ARTICLE
|2 ORCID
336 7 _ |a article
|2 DRIVER
440 _ 0 |a Journal of Electroceramics
|x 1385-3449
|0 3263
|v 9
500 _ _ |a Record converted from VDB: 12.11.2012
520 _ _ |a The influence of high temperature oxygen annealing on (100) oriented donor-doped SrTiO3 single crystals was studied. Crystalline precipitates were found on the optical scale on surfaces of lanthanum-doped as well as niobium-doped specimens with donor concentrations above 0.5 at.%. The amount of the secondary phase increases with the doping level, oxidation temperature and oxidation time. EDX analyses of the crystallites reveal a SrOx composition.The formation of the observed secondary phase is discussed by means of the defect re-equilibration of the cation sub-lattice. In view of the point defect model for donor-doped perovskites, n-conducting SrTiO3 changes its compensation mechanism during an oxidation treatment from "electronic compensation" (N-D = n) to "self-compensation" (N-D = 2[V-Sr"]) by forming cation vacancies. Due to the favored Schottky-type disorder in perovskites, the formation of strontium vacancies is accompanied by a release of strontium from the regular lattice. Since the excess strontium is found to be situated at the surface in form of SrO-rich precipitates only, we propose the formation of strontium vacancies via a surface defect reaction and the chemical diffusion of strontium vacancies from the surface into the crystal as the most probable re-equilibration mechanism for the oxidation treatment of single crystals.The introduced mechanism is in contrast to an established model which proposes the formation of Ruddlesden-Popper intergrowth phases SrO.(SrTiO3)(n) in the interior of the crystal.
536 _ _ |a Kondensierte Materie
|c M02
|2 G:(DE-HGF)
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588 _ _ |a Dataset connected to Web of Science
650 _ 7 |a J
|2 WoSType
653 2 0 |2 Author
|a perovskite
653 2 0 |2 Author
|a donor
653 2 0 |2 Author
|a cation vacancy diffusion
653 2 0 |2 Author
|a SrO secondary phase
653 2 0 |2 Author
|a Ruddlesden-Popper phases
700 1 _ |a Waser, R.
|b 1
|u FZJ
|0 P:(DE-Juel1)131022
700 1 _ |a Helmboldt, J.
|b 2
|0 P:(DE-HGF)0
700 1 _ |a Borchardt, G.
|b 3
|0 P:(DE-HGF)0
773 _ _ |g Vol. 9, p. 101 - 110
|p 101 - 110
|q 9<101 - 110
|0 PERI:(DE-600)1472395-5
|t Journal of electroceramics
|v 9
|y 2002
|x 1385-3449
909 C O |o oai:juser.fz-juelich.de:31698
|p VDB
913 1 _ |k M02
|v Kondensierte Materie
|l Kondensierte Materie
|b Materie
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914 1 _ |a Nachtrag
|y 2002
915 _ _ |0 StatID:(DE-HGF)0010
|a JCR/ISI refereed
920 1 _ |k IFF-EKM
|l Elektrokeramische Materialien
|d 31.12.2003
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970 _ _ |a VDB:(DE-Juel1)33398
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980 _ _ |a UNRESTRICTED
981 _ _ |a I:(DE-Juel1)PGI-7-20110106

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