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Outline
Electrical measurement under high pressure is an effective means to obtain physical property of materials. Using a microcircuit fabricated on a diamond anvil cell (DAC), we carried out the in-situ conductivity measurement on Fe3O4/β-CD at pressures. The electrical conductivity of the sample increases with pressure increasing to 39.9 GPa, experimental results indicate that Fe3O4/β-CD presents the transport behavior of a semiconductor. The abnormal conductivity changes at about 17.0 GPa is caused by the structural phase transition to high-pressure phase. The electrical conductivity indicates linear relation with pressure and can not return to original state，when the pressure comes back to ambient. As a result, we speculate high-pressure phase transition is not reversible.
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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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