Submitted on: 12 August 2005.
Revised on: 05 October 2005.
Accepted on: 27 October 2005.
___________________Journal of Alloys and Compounds
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Submitted on: 25 April 2006.
Revised on: 09 August 2006.
Accepted on: 12 September 2006.
___________________Journal of Alloys and Compounds