INVESTIGATION ON THE STRUCTURE AND PROPERTIES OF LA2-XSRXNIO4 OXIDES WITH TETRAHEDRON K2NIF4 STRUCTURE

According to the structure refinement of powder X-ray diffraction, it is found that, in this work, when x changes from 0.0 to 1.0, the cryst al lattice in La2-xSrxNiO4 oxides exists cation (La, Sr) and anion O(1 ) deficiency. It is agreed with the prediction of the values of temper ature factor (B). In addition, the content of Ni3+ ion parallels with the order of catalytic activities for CO oxidation. At x = 0.5 the Joh n-Tell er distortion of BO6 octahedra appears the maximum value, as wa s expected from the results of axial ratio c/a.