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|Title:||Bonding parameter, phase parameter and Ni K-edge position studies of some Ni systems|
|Authors:||Singh, Vinod K|
K-edge X-ray absorption spectra
|Abstract:||Extended X-ray absorption fine structure (EXAFS) phase shift studies of some nickel compounds have been carried out and the values of bonding parameter a<sub>1</sub> and phase parameter b<sub>1</sub> are evaluated by graphical method. a<sub>1</sub> is then correlated with nearest neighbour distance and ionicity of the corresponding systems. It has been observed that the bonding parameter a<sub>1</sub> decreases as bond distance decreases except in Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>.XH<sub>2</sub>O and NiCl<sub>2</sub>.6H<sub>2</sub>O and decreases with increase of the ionicity except for NiBr<sub>2</sub>. The phase parameter b<sub>1</sub> has been correlated with oxygen atoms present in a system. The nickel K-edge position in the systems under study has been correlated with ionicity. No good relation has been observed between ionicity and edge position. This has been attributed to different structure and coordination number of a system.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.44(01) [January 2006]|
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