[1] Korea Inst Mat Sci, Funct Ceram Grp, Chang Won 51508, South Korea
[2] Korea Maritime & Ocean Univ, Dept Elect Mat Engn, Busan 49112, South Korea
[3] Yeungnam Univ, Sch Mat Sci & Engn, Gyongsan 38541, South Korea
[4] Natl Inst Technol Tiruchirappalli, Dept Phys, Tiruchirappalli 620015, Tamil Nadu, India