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Synthesis of cubic boron nitride by structural induction effect

机译：结构感应效应合成立方氮化硼

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A novel structural induction method has been developed to synthesize cubic boron nitride (cBN) nanocrystals by the reaction of Li3N with BBr3 at very soft conditions (250degreesC and 0.3-0.5 Mpa). The experimental results show that at reaction temperature of 250degreesC, the reaction product is only hexagonal boron nitride without cubic gallium phosphide (GaP) nanocrystals being added into the reaction mixture. On the contrast, when cubic GaP nanocrystals were added to the mixture, nearly pure cBN can be obtained under the same reaction conditions. This phenomenon indicated that there was a structural induction effect of GaP to the formation of cBN. As the temperature increased, GaP nanocrystals decomposed rapidly and the structural induction effect disappeared, almost no cBN can be obtained at high temperature. Furthermore, the nucleation and growth of cBN nanocrystals were analyzed by the heterogenous nucleation theory. (C) 2004 Elsevier B.V. All rights reserved.
机译：已经开发了一种新型的结构诱导方法，该方法通过在非常软的条件下（250摄氏度和0.3-0.5 Mpa）使Li3N与BBr3反应来合成立方氮化硼（cBN）纳米晶体。实验结果表明，在250℃的反应温度下，反应产物仅为六方氮化硼，没有向反应混合物中添加立方磷化镓（GaP）纳米晶体。相反，当将立方GaP纳米晶体添加到混合物中时，在相同的反应条件下可以获得几乎纯的cBN。该现象表明GaP对cBN的形成具有结构诱导作用。随着温度的升高，GaP纳米晶体迅速分解，结构诱导效应消失，在高温下几乎无法获得cBN。此外，通过异质成核理论分析了cBN纳米晶体的成核和生长。 （C）2004 Elsevier B.V.保留所有权利。

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