“…8). 47),49) Thus, this compound can be regarded as being homeotypic to Al 5 C 3 N. The layer stacking sequences are <BABBABBAB>, <BBABBABBA> and/or <ABBABBABB> for the three types of domains of (Al,Si) 6 (O,C,N) 5 (space group R 3m and Z = 3), which is homeotypic to Al 6 C 3 N 2 . 48) In a similar manner, the layered oxycarbonitrides with the chemical formulas (Al,Si) 7 (O,C,N) 6 and (Al,Si) 8 (O,C,N) 7 are also homeotypic to, respectively, Al 7 C 3 N 3 and Al 8 C 3 N 4 .…”