Ab initio calculation of the evolution of [SiN4‐nOn] tetrahedron during β‐Si3N4(0001) surface oxidation. - Cai, Jianpeng; Hou, Xinmei; Fang, Zhi; Wang, Enhui; Feng, Jiao; Chen, Junhong; Liang, Tongxiang; Bei, Guoping (Journal of the American Ceramic Society, 2020)