A high-temperature in-situ pressure calibration diamond anvil press and pressure calibration method

Abstract

The invention relates to a high-temperature in-situ pressure calibration diamond-anvil press and a pressure calibration method, which belong to the technical field of physical quantity measurement under extreme conditions. Its structure is composed of three parts: pressure transmission module, pressure calibration module and heating experiment module. According to the coaxial axial total pressure is equal, the fitting P J1 ,P J2 ,P J3 ......P Jn‑1 ,P Jn , P B1 ,P B2 ,P B3 ......P Bn‑1 ,P Bn Correlation, get P J with P B Corresponding to the fitting relationship, the pressure value of the heating experiment module can be obtained according to the calibrated pressure value of the pressure calibration module. The invention solves the problem that the in-situ calibration of the high temperature pressure in the pressure chamber cannot be directly carried out under high temperature conditions by using the ruby ​​fluorescence method, and can provide accurate real-time pressure parameters for the measurement of the high temperature and high pressure physical properties in the anvil of the diamond to ensure the high temperature and high pressure experiment results accuracy of the analysis.

Description

Technical field: [0001] The invention belongs to the technical field of physical quantity measurement under extreme conditions, and in particular relates to a device and method for measuring real-time pressure in a sample chamber of an anvil with diamonds under high temperature conditions. Background technique: [0002] Diamond Anvil Cell (DAC for short) is currently the only scientific device that can generate 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 to squeeze the sample between the two coaxial and parallel anvil surfaces after being leveled and centered, so that the sample can obtain extreme pressure test conditions. With the help of DAC technology, various physical research can be realized, such as material structure research, Raman spectroscopy research, fluorescence spectroscopy research, magnetic conversio...

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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