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Structural position and oxidation state of nickel in SrTiO3 | | Irina A. Sluchinskaya
; Alexander I. Lebedev
; Alexei Erko
; | | Date: |
18 Jul 2013 | | Abstract: | The properties of Ni-doped strontium titanate are studied using X-ray
diffraction and XAFS spectroscopy. It is shown that regardless of the
preparation conditions, the SrTi1-xNixO3 solid solution and the NiTiO3 phase
are the most stable phases which can coexist. According to the EXAFS data, in
the single-phase sample of SrTi0.97Ni0.03O3, the Ni atoms substitute for the Ti
ones and are on-center. The distortion of the oxygen octahedron, which could
occur in the case of the oxygen vacancy presence in the nickel environment, is
not observed. The XANES spectra analysis shows that the oxidation state of
nickel in NiTiO3 is 2+, and in the SrTi1-xNixO3 solid solution it is close to
4+. It is shown that the strongest light absorption in doped samples is
associated with the presence of tetravalent nickel in the SrTi1-xNixO3 solid
solution. This doping seems the most promising one for solar energy converters
that exploit the bulk photovoltaic effect. | | Source: | arXiv, 1307.5082 | | Services: | Forum | Review | PDF | Favorites | |
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