高温高压法合成层状BCx化合物  

SYNTHESIS OF LAYERED BC_x COMPOUND UNDER HIGH PRESSURE AND HIGH TEMPERATURE

作　　者：胡前库[1,2] 吴庆华[1,2] 孙广[1,2] 于栋利[2] 何巨龙[2] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454010 [2]燕山大学 亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《硅酸盐学报》2010年第5期873-877,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50802024);河南理工大学青年骨干教师资助计划;河南理工大学博士基金(B2008–51,B2009–17)资助项目

摘　　要：以石墨和非晶硼粉为原料,用机械球磨法制备非晶态前驱物,然后在高温高压下制得了晶化程度较高的类石墨层状BCx(x≥3)化合物。利用X射线衍射、透射电子显微镜和电子能量损失谱对样品的物相、形貌和成分进行了表征。结果表明:在5.5GPa下,温度为800～1000℃时,合成的样品是结晶较好的BCx(x≥3)颗粒;当温度高于1000℃时,样品中只含有B4C颗粒和纯C颗粒,未生成层状BCx颗粒。Amorphous B–C precursors were prepared by the mechanical milling method using graphite and amorphous boron （B） powders as raw materials. And then, the well-crystallized BCx with graphite-like layer structure was synthesized at high pressure and high temperature. The phase structure, morphology and composition of the synthesized samples were characterized by X-ray diffraction, transmission electron microscopy and electron energy loss spectroscopy. The results indicate that at the pressure of 5.5 GPa and the temperature of 800–1 000 ℃, the synthesized sample is crystalline layered BCx （x≥3） particles with different compositions. However, when the temperature is higher than 1 000 ℃, the obtained sample only contains B4C and pure carbon particles.

关 键 词：层状硼碳化合物 碳 高温高压 机械球磨 硼 

分 类 号：O613.71[理学—无机化学] O621.259.1[理学—化学]