Pressure loading device for high-pressure neutron diffraction

Abstract

The invention provides a pressure loading device for high-pressure neutron diffraction. The device comprises an anvil assembly. The anvil assembly comprises an upper anvil and a lower anvil with opposite anvil surfaces, the anvil surfaces of the upper anvil and the lower anvil are respectively sunken inwards relative to the axial directions of the upper anvil and the lower anvil to form an arc-shaped upper anvil surface and an arc-shaped lower anvil surface. The pressure loading device also comprises a sealing gasket assembly and a diamond pressurizing sheet, wherein the sealing gasket assembly is arranged between the two anvils, a pressure cavity is defined by an inner cavity of the sealing gasket assembly, the upper anvil face and the lower anvil face, and the diamond pressurizing pieceis arranged in the inner cavity of the sealing gasket assembly and divides the pressure cavity into an upper pressure cavity body and a lower pressure cavity body.

Description

technical field [0001] The invention belongs to the technical field of in-situ neutron diffraction devices, and in particular relates to a pressure loading device for high-pressure neutron diffraction. Background technique [0002] When performing in situ neutron diffraction experiments, under uniaxial loading, radial diffraction mode and sample volume greater than 10mm 3 Under the premise of the 30GPa ultra-high pressure cavity, it cannot be obtained by directly using the diamond on the platform surface to load the titanium-zirconium gasket on the anvil like the anvil cavity used for synchrotron radiation, because the titanium-zirconium gasket The strength is only 0.7GPa, and cannot be greater than 10mm 3 The premise of the sample is to achieve a 30GPa high-pressure chamber seal. At present, the pressure chamber commonly used in high-pressure neutron diffraction in the world is composed of a ring-shaped concave anvil and a ring-shaped titanium-zirconium gasket. Although t...

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Problems solved by technology

[0002] When performing in situ neutron diffraction experiments, under uniaxial loading, radial diffraction mode and sample volume greater than 10mm 3 Under the premise of the 30GPa ultra-high pressure cavity, it cannot be obtained by directly using the diamond on the platform surface to load the titanium-zirconium gasket on the anvil like the anvil cavity used for synchrotron radiation, because the titanium-zirconium gasket The strength is only 0.7GPa, and cannot be greater than 10mm 3 Realize 30GPa high-pressure chamber sealing under the premise of the sample

At present, the pressure chamber commonly used in high-pressure neutron diffraction in the world is composed of a ring-shaped concave anvil and a ring-shaped titanium-zirconium gasket. Although this pressure chamber can reach a cavity pressure of 25GPa under a load of 200 tons, the conventional The test generally does not exceed 20GPa, because when the load exceeds 150 tons, most of the experiments will be terminated due to the failure of the titanium-zirconium gasket, and the anvil will also be damaged

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