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|Title:||Bonding parameter, phase parameter and Ni K-edge position studies of some Ni systems|
|Authors:||Singh, Vinod K|
|Keywords:||EXAFS;XAFS;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 a1 and phase parameter b1 are evaluated by graphical method. a1 is then correlated with nearest neighbour distance and ionicity of the corresponding systems. It has been observed that the bonding parameter a1 decreases as bond distance decreases except in Ni3(PO4)2.XH2O and NiCl2.6H2O and decreases with increase of the ionicity except for NiBr2. The phase parameter b1 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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