[Xu, Xuewen; Luo, Han; Huang, Yang; Xue, Yanming; Li, Jie; Lin, Jing; Liu, Zhenya; Jin, Peng; Zhang, Jun; Tang, Chengchun] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China.
[Xu, Xuewen; Luo, Han; Huang, Yang; Xue, Yanming; Li, Jie; Lin, Jing; Liu, Zhenya; Jin, Peng; Zhang, Jun; Tang, Chengchun] Hebei Key Lab Boron Nitride Micro & Nano Mat, Tianjin 300130, Peoples R China.
[Ding, Xiaoxia] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
[Lin, Jing; Zou, Jin] Univ Queensland, St Lucia, Qld 4072, Australia.
[Zou, Jin] Univ Queensland, Ctr Microscopy & Microanal, St Lucia, Qld 4072, Australia.