[Zhong, Yuan; Wu, Fangfang; Zhou, Zhi; Zhou, Nan] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
[Xia, Mao] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.
[Lei, Bingfu] South China Agr Univ, Dept Mat Sci & Engn, Guangzhou 510642, Guangdong, Peoples R China.
[Wang, Jing] Sun Yat Sen Univ, Sch Mat Sci & Engn, Sch Chem, Guangzhou 510275, Guangdong, Peoples R China.