【摘要】 实验制备了复合氮化物Ｌｉ＿８ＳｉＮ＿４，并对合成温度、合成时间、气流量等因素的影响以及产物的稳定性进行了讨论。研究了Ｌｉ＿８ＳｉＮ＿４作为触媒添加剂时硅在ｃＢＮ单晶合成中的作用。结果表明：ｃＢＮ晶体多为截角八面体，晶面致密光滑；硅参与ｃＢＮ的合成反应，并以ＳｉＯ＿２的形式沉积在ｃＢＮ表面。更多还原

【Abstract】 Ternary nitride Li₈SiN₄ is prepared at 700～750℃ in N₂ by solid state reactionwith LiH and Si₃N₄. Effects of reaction temperature,time and circumstance as well as stabilityon pure phase Li₈SiN₄ are studied in detail.Cubic BN is synthesized using Li-complex nitride andadditive Li₈SiN₄ as catalyst-solvent in order to examine the behavior of silicon. The morphologyand surface structure of cBN crystals are observed by SEM. Most of cBN crystals show off trun-cated octahedral shapes,and crystal surfaces are smooth and dense.The results suggest thatLi₈SiN₄ involves in the reaction for hBN to cBN and is in the form of SiO₂ deposited on its sur-face.更多还原