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The properties of Ni-doped strontium titanate are studied using X-raydiffraction and XAFS spectroscopy. It is shown that regardless of thepreparation conditions, the SrTi1-xNixO3 solid solution and the NiTiO3 phaseare the most stable phases which can coexist. According to the EXAFS data, inthe single-phase sample of SrTi0.97Ni0.03O3, the Ni atoms substitute for the Tiones and are on-center. The distortion of the oxygen octahedra is not observed.The XANES spectra analysis shows that the oxidation state of nickel in NiTiO3is 2+, and in the SrTi1-xNixO3 solid solution it is close to 4+. It is shownthat the strongest light absorption in doped samples is associated with thepresence of tetravalent nickel in the SrTi1-xNixO3 solid solution. This dopingseems the most promising one for solar energy converters that exploit the bulkphotovoltaic effect.

Structural position and oxidation state of nickel in SrTiO3