Structural position and oxidation state of nickel in SrTiO_(3)

作     者：Irina A.Sluchinskaya Alexander I.Lebedev Alexei Erko 

作者机构：Physics DepartmentMoscow State University Leninskie gory119991 MoscowRussia Helmholtz-Zentrum Berlin Albert-Einstein-Str.1512489 BerlinGermany 

出 版 物：《Journal of Advanced Dielectrics》 (先进电介质学报（英文）)

年 卷 期：2013年第3卷第4期

页      面：43-49页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by Russian Foundation for Basic Research(Grant No.13-02-00724) 

主　　题：XAFS spectroscopy impurities strontium titanate solar energy conversion 

摘      要：The properties of Ni-doped strontium titanate are studied using X-ray diffraction and XAFS *** is shown that regardless of the preparation conditions,the SrTi_(1-x)Ni_(x)O_(3) solid solution and the NiTiO_(3) phase are the most stable phases which can *** to the EXAFS data,in the single-phase sample of SrTi_(0.97)Ni_(0.03)O_(3),the Ni atoms substitute for the Ti ones and are *** distortion of the oxygen octahedra is not *** XANES spectra analysis shows that the oxidation state of nickel in NiTiO_(3) is 2+,and in the SrTi_(1-x)Ni_(x)O_(3) 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 SrTi_(1-x)Ni_(x)O_(3) solid *** doping seems the most promising one for solar energy converters that exploit the bulk photovoltaic effect.