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Submitted on: 24 April 2002.
Revised on: 15 August 2002.
Accepted on: 26 September 2002.
___________________Journal of Advanced Ceramics---TSINGHUA UNIV PRESS
Submitted on: 05 February 2015.
Revised on: 04 March 2015.
Accepted on: 17 April 2015.
___________________Journal of Advanced Ceramics---TSINGHUA UNIV PRESS
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Submitted on: 21 February 1998.
Revised on: 22 April 1998.
Accepted on: 14 June 1998.
___________________Journal of Advanced Ceramics---TSINGHUA UNIV PRESS