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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1107/S1600577518013954
|2 doi
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|a pubmed24n0967.xml
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|a (DE-627)NLM290399645
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|a (NLM)30407179
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|a DE-627
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|c DE-627
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|a eng
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|a Okube, Maki
|e verfasserin
|4 aut
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|a Site occupancy of Fe2+, Fe3+ and Ti4+ in titanomagnetite determined by valence-difference contrast in synchrotron X-ray resonant scattering
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 09.11.2018
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|a Date Revised 09.11.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a A synchrotron X-ray diffraction study of a single crystal of titanomagnetite shows that the cation distribution of Fe2+, Fe3+ and Ti4+ is of the inverse-spinel type. The valence-difference contrast (VDC) method of resonant scattering was applied at a wavelength of λ = 1.7441 Å (E = 7.1085 keV) within the pre-edge of the Fe K absorption spectrum, utilizing the large difference in the real part of anomalous scattering factors, between -7.45 and -6.50, for Fe2+ and Fe3+, respectively. The most plausible atomic arrangement in Ti0.31Fe2.69O4 obtained from our analysis is [Fe3+1.00]A[Fe3+0.38Fe2+1.31Ti4+0.31]BO4, where A and B in an AB2O4-type structure correspond to the tetrahedral and octahedral sites, respectively. This result suggests that titanomagnetite has the complete inverse-spinel structure continuously from the end-member of magnetite, even in the case of relatively high Ti content. The physical properties may be described by the Néel model, which claims that Fe3+ preferentially occupies the tetrahedral site, within a Ti-poor half-region of the solid solution. Based on the ordering scheme the magnetic structure of titanomagnetite is considered to be analogous to that of magnetite. The combination of circularly polarized X-rays and a horizontal-type four-circle diffractometer used in this VDC technique has the advantage of increasing the experimental accuracy and freedom with the simultaneous reduction of experimental noise
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|a Journal Article
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|a Fe K absorption edge
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|a anomalous scattering
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|a resonant scattering
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|a single-crystal X-ray diffraction
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|a titanomagnetite
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|a valence-difference contrast
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|a Oshiumi, Taro
|e verfasserin
|4 aut
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|a Nagase, Toshiro
|e verfasserin
|4 aut
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|a Miyawaki, Ritsuro
|e verfasserin
|4 aut
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|a Yoshiasa, Akira
|e verfasserin
|4 aut
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|a Sasaki, Satoshi
|e verfasserin
|4 aut
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|a Sugiyama, Kazumasa
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of synchrotron radiation
|d 1994
|g 25(2018), Pt 6 vom: 01. Nov., Seite 1694-1702
|w (DE-627)NLM09824129X
|x 1600-5775
|7 nnns
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|g volume:25
|g year:2018
|g number:Pt 6
|g day:01
|g month:11
|g pages:1694-1702
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|u http://dx.doi.org/10.1107/S1600577518013954
|3 Volltext
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|h 1694-1702
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