X‐Ray Investigation of the Al—B—N Ternary System: Isothermal Section at 1500 °C: Crystal Structure of the Al0.185B6CN0.256 Compound.

Abstract The equilibrium phase diagram has been established using X-ray powder diffraction for the ternary Al–B–N system over the whole concentration region at 1500 °C. No ternary compounds have been observed. The crystal structure of the Al 0.185 B 6 CN 0.256 compound ( Cmcm space group, Z =8, a =5.685(2) A, b =8.903(3) A, c =9.122(3) A, V =461.70 A 3 , ρ =2.563 g/cm 3 , μ =0.17 mm −1 , R =0.0424 for 407 reflections with F o >4 σ ( F o )) was determined from single crystal X-ray diffraction (automatic diffractometer BRUKER AXS CCD, Mo Kα radiation) and electron microprobe analysis. The structure is related to the Al 0.61 B 6.50 , Al 0.253 B 6.37 C and Al 0.325 B 6 C structures.