SHORT-RANGE ORDER IN NANOCRYSTALLINE COBALT

The EXAFS measurements an polycrystalline and nanocrystalline Co sampl es were performed at the PULS synchrotron radiation facility. In contr ast to the conventional EXAFS data analysis using an inverse Fourier t ransformation we have applied a modified regularization algorithm in o rder to determine the pair correlation function (PCF) by solving the i ntegral EXAFS equation. The PCF for a polycrystalline sample indicates several separate peaks located on true interatomic distances. For nan ocrystalline cobalt we obtain a reduction of the first coordination nu mber (N = 6.4 at.). The results obtained ave discussed.