Full
Outline
By a self-made system based on a cubic anvil high-pressure apparatus and an Agilent 4294A accurate impedance analyzer, real time high frequency dielectricity measurement under hydrostatic pressure is realized by the standard four-wire method widely used in ambient pressure dielectric research. The sealing of liquid cell in solid pressure-transmission medium and multi signal lines out through gaskets including four micro-coaxial cables is achieved by the pre-formation of pyrophyllite cube together with gaskets. The testing fixture, 10 mm×10 mm sample, pressure-temperature sensors and as many as 16 signal wires including 4 micro-coaxial cables with an outer diameters of 1.6 mm respectively can be contained simultaneously in a liquid testing cell with a volume of (Ø13×15) mm3. Four-wire impedance spectroscopy can be obtained by this system in a measurement range of room temperature to 300 ℃, ambient pressure to about 3 GPa hydrostatic pressure and testing frequency from 40 Hz to 5 MHz with an experiment error below 3%. The pressure induced ferroelectric-paraelectric phase transition of a BaTiO3 single crystal is observed using this setting up.
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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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