Inducing effect of halide species in the hydrothermal synthesis of cubic boron nitride

New strategies for selectively synthesizing cubic boron nitride in hydrothermal solutions

“…We previously reported that both Cl À and F À could promote the formation of cBN and F À showed much stronger induction effect than Cl À . 14 Here we observed similar phenomenon when using NH 3 $H 2 O as the nitrogen source. By comparing the XRD patterns of S-2 and S-7 (Fig.…”

The etching process of boron nitride by alkali and alkaline earth fluorides under high pressure and high temperature

“…Extensive theoretical and experimental studies have been performed on surface reactivity of cBN thin films. It is noticed that fluorine is mostly used as a selective etching agent to prevent the formation of sp 2 BN phases and stabilize sp 3 bonds of BN in the chemical process, indicating the crucial role to improve the quality of the cBN materials [13][14][15][16][17][18]. It is also very important to note that, under HPHT conditions, the etching process of BN is much stronger and some characteristics of surface etching are easily obtained, which do not exist under deposition conditions.…”

Synthesis and formation mechanism of cubic boron nitride nanorods in lithium bromide molten salt

“…On the other hand, considerable efforts have been devoted to new synthesis strategies under convenient conditions. For example, Hu et al synthesized cBN at 650 1C by reacting KBH 4 and NH 4 Cl [14], and Cui et al reported some results on soft chemistry growth of cBN materials in benzene [15] or water [16][17][18].…”