用(C2H5)2O·BF3和Li3N苯热合成cBN机理探讨

 以(C₂H₅)₂O·BF₃和Li₃N为原料，于苯热条件下合成氮化硼并研究其相变机理。X射线粉末衍射和傅立叶变换红外吸收光谱分析证明，产物中不仅有hBN和cBN物相存在，而且还发现了正交氮化硼（oBN）和锂硼氮的常压相Li₃BN₂(O)及高压相Li₃BN₂(T)存在。分析了Li₃BN₂在高温高压条件下和在苯热条件下对合成cBN催化机制的差异，探讨了Li₃BN₂在以Li₃N和(C₂H₅)₂O·BF₃为原料合成BN的催化机制，提出常压相Li₃BN₂(O)和高压相Li₃BN₂(T)分别对生成cBN和oBN起催化作用的观点。

Discussion on the Mechanism of cBN Synthesized by Benzene Thermal Method Using (C2H5)2O·BF3 and Li3N as Reactants

BN is synthesized by benzene thermal method using (C₂H₅)₂O·BF₃ and Li₃N as reactants and its phase transition mechanism is studied. Not only hBN and cBN are found in the products testified by XRD and FTIR, but also oBN, atmosphere form Li₃BN₂(O) and high pressure form Li₃BN₂(T) are discovered. The differences of cBN catalytic mechanism between high pressure and high temperature method and benzene thermal synthesis method are analyzed. Furthermore, the catalytic mechanism of Li₃BN₂ to synthesize BN using Li₃N and (C₂H₅)₂O·BF₃ as reactants is discussed. At the same time, it stands out the atmosphere form Li₃BN₂(O) and the high pressure form Li₃BN₂(T) can catalyze the synthesis of cBN and oBN, respectively.