BN is a chemical compound, consisting of equal numbers of boron (B) and nitrogen (N) atoms, which is not found in nature and is therefore produced synthetically. BN is isostructural to carbon (C) and exists in various crystalline forms. e hexagonal form (h-BN) is analogous to graphite with a layered structure. is can also be stacked in a rhombohedral form. e other common structure of BN is the cubic form (c-BN), which is similar to diamond and is the second hardest material known so far. ere is also a rare wurtzite form, which is similar to lonsdaleite (Pakdel et al. 2014).