The principle
reflection is located around 2θ 26.6° and can be assigned to the
(002) reflection of the graphite-like h-BN structure [28]. Additional yet much weaker peaks are observed around 42.3°, corresponding to the (100)/(101) reflections, in close agreement with
the Joint Committee on Powder Diffraction Standards (JCPDS) card
no. 34–0421