can't read?
Boron nitride is a heat- and chemically resistant refractory compound of boron and nitrogen with the chemical formula BN. It exists in various crystalline forms that are isoelectronic to a similarly structured carbon lattice
B 1975 Boron nitride, 99% Cas no 10043-11-5 - used in the fabrication and luminescence study of monolayered boron nitride quantum dots.