Boron carbide B₂₅C and B8C₁₈ synthesized using boric acid-glucose and boric acid-active carbon at low temperature without coreductor materials

This study examines the formation of Boron carbide with a wide homogeneity range B₈C₁₈ and B₂₅C, from boric acid -glucose and boric acid-active carbon as precursor materials. The samples was analyzed by X-ray diffraction and Fourier Transform Infrared spectrometer. X-ray diffraction pattern was analyzed by GSAS software. X ray diffraction pattern of B₈C₁₈ shows peaks at 27°, 39°, 45°, 65° and 79°, orthorhombic crystal system and lattice parameters a =13.640 Ǻ;, b = 7.8500 Ǻ and c = 12.910 Ǻ; and space group P_{21 21 21}, whereas for B₂₅C sample show peaks at 2θ angle 28° and 40°, tetragonal crystal system, and the lattice parameters a = b = 8.753 Ǻ; and c = 5.093 Ǻ; and space group P -4 2 m. FTIR results show that for B₈C₁₈ have absorption bands with BC bond at 1196.5 cm^-1, 0-H 3216.7 cm^-1 and B-O at 1477.1 cm^-1, whereas the formation B₂₅C have absorption bands with B-C bond at 1195.1 cm^-1, O-H 3216.7 cm^-1 and B-O 1460.8 cm^-1.