Full
Outline
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. Mössbauer 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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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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