[1] Changwon Natl Univ, Dept Ceram Sci & Engn, Changwonsi 641773, Gyeongnam, South Korea
[2] Korea Inst Sci & Technol, Div Ceram, Seoul 136791, South Korea
[3] Korea Inst Ceram Engn & Technol, Dept Ceram, Seoul 153801, South Korea
[4] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA