Submitted on: 22 August 2013.
Revised on: 20 September 2013.
Accepted on: 14 October 2013.
Physics and Chemistry of Solid State
Submitted on: 22 December 2007.
Revised on: 17 January 2008.
Accepted on: 12 February 2008.
Physics and Chemistry of Solid State
Submitted on: 07 February 2015.
Revised on: 20 February 2015.
Accepted on: 05 March 2015.
Physics and Chemistry of Solid State
Submitted on: 17 October 2007.
Revised on: 03 November 2007.
Accepted on: 11 November 2007.
Physics and Chemistry of Solid State
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