A two-stage supercharging device based on single-shaft loading

Abstract

The invention provides a two-stage pressurizing device based on uniaxial loading for an in-situ neutron diffraction experiment. The two-stage pressurizing device comprises two first-stage anvil cells with opposite anvil faces and a seal located between the anvil faces of the two first-stage anvil cells. A portion in the seal on the opposite anvil faces of the two-stage anvil cells is punched as a first-stage pressure cavity; a second pressurizing ring is arranged in the first-stage pressure cavity; the outer wall of the second pressurizing ring coincides with the inner wall of the first-stage pressure cavity; the outer diameter of the second pressurizing ring is smaller than or equal to the inner diameter of the first-stage pressure cavity; second-stage pressurizing sheets, the diameters of which are equal to or slightly smaller than the inner diameter of the second-stage pressurizing ring, are separately arranged on upper and lower openings of the second-stage pressurizing ring; a space encircled by the second-stage pressurizing ring and the second-stage pressurizing sheets become a second-stage sample cavity for holding a sample; after sampling in an experiment, the two second-stage pressurizing sheets are partially or fully embedded into the second-stage pressurizing ring, so that the problem that the sample cavity punched in the seal is expanded as a result of transverse extrusion of the sample is solved, and the problem that the sample is thinned as the pressure is increased in the in-situ neutron diffraction experiment is also solved.

Description

technical field [0001] The present invention relates to in-situ neutron diffraction experiment technology, more specifically, it provides a two-stage supercharging device based on uniaxial loading for in-situ neutron diffraction, which is used for the structural properties and physical properties of materials under ultra-high pressure Measurement. Background technique [0002] The counter-anvil system is one of the most common devices for generating static high pressure in solid and liquid samples, and in-situ observation is essential in order to obtain structural information of condensed matter under high pressure. There are generally two techniques for high-pressure in-situ structure diffraction observation: synchrotron radiation X-ray diffraction and neutron scattering. Diamond anvil (DAC) combined with synchrotron radiation technology has formed a typical anvil system in the megapascal (MPa) range. The anvil observes the sample in situ, and the sample size is generally ...

AI Technical Summary

Problems solved by technology

The secondary increasing tube and the secondary boosting sheet in the secondary boosting device provided by the present invention are made of polycrystalline diamond. Diamond has very high hardness and is not easy to deform under high pressure. The secondary boosting ring connects the sample with the sealed spacer between the anvil and the gasket, thus solving the problem that the sample cavity punched on the gasket is enlarged due to the lateral extrusion of the sample. The problem of deformation and thinning under anvil extrusion finally solved the problem of sample thinning with increasing pressure during in situ neutron diffraction experiments

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