Analysis of Graphite-Hexagonal Boron Nitride (g-hBN) Micro-Crystal Mixture Treated under High-Pressure and High-Temperature
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摘要: 为了进一步研究用球磨法制备B-C-N物质的规律性,在4.5~5.8 GPa压力、800~1 300 ℃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4.5 GPa、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1 300 ℃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5.8 GPa而温度保持1 300 ℃时,结果变化不大。Abstract: 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 heattreated 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 BC3N 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.
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