高压热处理石墨-六角氮化硼微晶混合物的结果分析

Analysis of Graphite-Hexagonal Boron Nitride (g-hBN) Micro-Crystal Mixture Treated under High-Pressure and High-Temperature

为了进一步研究用球磨法制备B C N物质的规律性,在4 5～5 8GPa压力、800～1300℃温度条件下,对用球磨法获得的石墨 六角氮化硼微晶混合物进行高压热处理。热处理后产物的XRD、XPS及FT IR测试表明:在4.5GPa、800℃时,样品中出现部分hBN晶化现象,但石墨仍然保持微晶状态;当温度升到1300℃时,样品中不仅存在晶化的hBN,而且出现一种类石墨结构的B C N三元化合物。与相关研究资料对比后认为:这一新化合物近似于BC3N。压力增加到5 8GPa而温度保持1300℃时,结果变化不大。

For further research of the regularity of B-C-N material prepared by ball-milling method,the micro-crystal mixture of graphite-hexagonal boron nitride (g-hBN) is heat-treated under the pressure of 45～58 GPa and the temperature of 800 ℃～1 300 ℃.XRD,XPS and FT-IR analysis of the heat-treated products shows:at 4.5 GPa and 800 ℃,there is partial crystallization of hexagonal boron nitride (hBN) in samples,but the graphite keeps the status of micro-crystallization;and at 1 300 ℃,samples not only have crystallization of hBN but also have ternary compound of B-C-N,which is analogous to graphite structure.We considered that the new compound was approximate to BC_3N when we had compared with correlative information of studies.When the pressure is up to 58 GPa and the temperature stays at 1 300 ℃,the changes of result are less.