High-temperature and high-pressure loading device for in-situ neutron diffraction

Abstract

The invention discloses a high-temperature and high-pressure loading device for in-situ neutron diffraction. A groove is formed in an anvil in the device; a graphite tube is arranged in the groove; pressure transmission mediums I and II are arranged in grooves in the periphery of the graphite tube separately; a magnesium oxide tube is arranged in the graphite tube; a pressure transmission medium III and a titanium-zirconium ring are sequentially arranged on the periphery of the groove; a bakelite ring is arranged on the periphery of the anvil; the periphery of the titanium-zirconium ring and the bakelite ring are concentrically laminated; a steel ring is arranged on the periphery of the bakelite ring; the bakelite ring and the steel ring are concentrically laminated; a round hole is formed in one side of the center of the steel ring and a window is correspondingly formed in the other side; the round hole, the window and the center of the titanium-zirconium ring are located in the same horizontal line; and a thermocouple horizontally passes through the magnesium oxide tube. The high-temperature and high-pressure loading device is capable of generating a high-temperature and high-pressure sample environment and carrying out in-site observation by using neutron diffraction at the same time. Temperature and pressure calibration is carried out in the magnesium oxide tube, the generated high pressure is about 7GPa and the temperature is 1500K.

Description

technical field [0001] The invention belongs to the field of neutron static high pressure, and in particular relates to a high-temperature and high-pressure loading device for in-situ neutron diffraction. Background technique [0002] In modern physics, most of the theories are based on various interactions between atoms, and this pattern is determined by the spacing of atoms and the symmetry of crystallography. Pressure and temperature are the basic physical ways to change the interatomic distance. Experiments using pressure and temperature to change the interatomic distance and its symmetry are of great value in understanding the structure of materials, changing the properties and applications of materials. From the perspective of crystal structure, it is of special significance to track the dynamic process of the phase transition of its structure under pressure and temperature. Therefore, it is of great significance to observe the structure and physical behavior changes ...

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Problems solved by technology

But for lighter elements, and isotopic materials X-rays often cannot get effective results

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