High-temperature in-situ pressure calibration diamond anvil cell press and pressure calibration method

Abstract

The invention discloses a high-temperature in-situ pressure calibration diamond anvil cell press and a pressure calibration method, and belongs to the technical field of physical quantity measurementunder extreme conditions. The high-temperature in-situ pressure calibration diamond anvil cell press is structurally composed of three parts including a pressure conduction module, a pressure calibration module and a heating experiment module. According to the fact that the coaxial axial total pressure is equal, the mutual relation of PJ1, PJ2, PJ3,..., PJn-1, PJn, PB1, PB2, PB3,..., PBn-1 and PBnis fitted, the corresponding fitting relation of PJ and PB is obtained, and the pressure value of the heating experiment module can be obtained according to the pressure value calibrated by the pressure calibration module. The problem that in-situ calibration of the high-temperature pressure in the pressure cavity cannot be directly carried out under the high-temperature condition through a rubyfluorescence method is solved, accurate real-time pressure parameters can be provided for high-temperature and high-pressure physical property measurement in the diamond anvil cell, and the analysis accuracy of a high-temperature and high-pressure experiment result is guaranteed.

Description

Technical field: [0001] The invention belongs to the technical field of physical quantity measurement under extreme conditions, in particular to a device and method for measuring the real-time pressure in a sample cavity of a diamond anvil under high temperature conditions. Background technique: [0002] Diamond Anvil Cell (DAC) is currently the only scientific device capable of generating a static pressure of one million atmospheres, and is the most important scientific instrument in the field of high-pressure science and technology research. It mainly uses two specially made diamond anvils after leveling and centering, and then squeezes the sample between the two anvil surfaces that are coaxial and parallel, so that the sample can obtain extreme pressure test conditions. With the help of DAC technology, a variety of physical studies can be achieved, such as material structure research, Raman spectroscopy, fluorescence spectroscopy, magnetic transformation, electrical prope...

AI Technical Summary

Problems solved by technology

[0004] However, the ruby ​​fluorescence method is very susceptible to the influence of the ambient temperature of the ruby. When the temperature cannot be stabilized at room temperature, the intensity and position of the fluorescence peak at a certain pressure will change, resulting in pressure in the pressure chamber. There is a large error in the calculation, which affects the accuracy of the pressure value

Moreover, when using the existing DAC technology for high-temperature and high-pressure tests, it is inevitable that the ambient temperature of the ruby ​​will change, making it difficult to obtain accurate experimental pressure values.

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