Influence of FeMn Powder Catalyst on the Synthesis of Diamond
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摘要: 利用FeMn粉末触媒在国产六面顶压机上进行了合成金刚石单晶的实验，研究了高温高压条件下（5.7 GPa、1 550 ℃），石墨-FeMn粉末触媒体系中金刚石单晶的生长特性。通过光学成像显微镜观测表明：合成出的金刚石单晶呈浅黄色，晶形完整，且都是八面体，晶体里含有白色物质，粒度集中在0.3~0.5 mm；通过扫描电镜观测了晶体的表面形貌，表面有熔坑；通过穆斯堡尔谱，发现粉末触媒里主要是FeMn合金和独立状态的Fe，金刚石内部主要是Fe和Fe3C；利用X射线荧光光谱，检测出样品里有Fe和Mn元素。Abstract: FeMn powder catalyst was employed to synthesize diamond in China-type cubic high-pressure apparatus. Fine single crystal diamond was successfully obtained in the graphite-FeMn system at 5.7 GPa and 1 550 ℃. The optical imaging microscopy observations show that all the synthesized diamond is in light yellow octahedral crystals with grain size of 0.3-0.5 mm. Moreover, there is plenty of white substance in the crystals. The surface morphology of crystals is checked by SEM, and craters can be found in the crystal surface. Mossbauer spectrum is used to detect the impurity in the diamonds. FeMn alloy and independent state Fe are the two states in catalysts, and inclusions in diamond mainly contained Fe and Fe3C. Fe and Mn were detected in the sample using X-ray fluorescent spectrum.
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Key words:
- diamond /
- High Temperatures-High Pressures /
- Mossbauer spectrum
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