Affiliation: | a College of Materials Science and Chemical Engineering, Yanshan University, No. 438 Hebei Street West, Qinhuangdao, Hebei 066004, People's Republic of China b State Key Laboratory for Superhard Materials, Jilin University, Changchun 130023, People's Republic of China c Faculty of Engineering, Hiroshima University, Hiroshima 739-8511, Japan |