Submitted on: 10 March 2000.
Revised on: 13 April 2000.
Accepted on: 13 May 2000.
___________________ECS Journal of Solid State Science and Technology
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Submitted on: 09 September 2003.
Revised on: 20 November 2003.
Accepted on: 06 December 2003.
___________________ECS Journal of Solid State Science and Technology
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Submitted on: 27 February 2006.
Revised on: 02 June 2006.
Accepted on: 27 July 2006.
___________________ECS Journal of Solid State Science and Technology