Method for preparing helium crystals under normal pressure

A crystalline, atmospheric-pressure technique with applications in astrophysical and nuclear materials

Pending Publication Date: 2021-06-15
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Abstract
  • Description
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Problems solved by technology

[0003] Aiming at the defects and problems that no helium crystal can be prepared under normal pressure at present, the present invention provides a method for preparing helium crystal under normal pressure

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  • Method for preparing helium crystals under normal pressure
  • Method for preparing helium crystals under normal pressure
  • Method for preparing helium crystals under normal pressure

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Embodiment 1

[0016] Embodiment 1: This embodiment provides a method for preparing helium crystals under normal pressure. In order to support the method of the present invention, this embodiment first adopts the method of molecular dynamics to verify its feasibility from a theoretical point of view. This method is based on the interparticle Interaction, a method to obtain material property information by solving the equation of motion of each particle. Its research object is a multi-particle system, the number of particles is usually between a few to hundreds of thousands, and the simulation time is generally on the order of femtoseconds to nanoseconds. The movement of each particle in the system follows the classical mechanics equation of motion. In classical mechanics, as long as the initial position and velocity are given, the position and velocity of the particle at any time in the future are determined. Therefore, the molecular dynamics method is a A deterministic method, the movement ...

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Abstract

The invention belongs to the technical field of celestial physics and nuclear materials, and particularly relates to a method for preparing helium crystals under normal pressure. According to the method, only a low-temperature condition needs to be provided, a system is kept at a constant temperature, low-energy helium atoms are injected into a titanium metal substrate layer with dislocation and small-angle grain boundaries one by one, and due to the pressure action of a titanium substrate, the helium atoms migrate, gather and nucleate on the titanium metal substrate layer and gradually grow towards a slip plane. Along with continuous introduction of helium and continuous growth of helium bubbles, the atom arrangement is always kept in a close-packed hexagonal crystal structure to form helium crystals, crystal helium of the close-packed hexagonal structure can be prepared by utilizing the pressure intensity in metal, the condition limitation that helium is liquefied or solidified by utilizing a high-pressure device traditionally is broken through, and normal-pressure preparation of the helium crystals becomes possible.

Description

technical field [0001] The invention belongs to the technical field of astrophysics and nuclear materials, and in particular relates to a method for preparing helium crystals under normal pressure. Background technique [0002] In the fields of astrophysics and nuclear materials, research on high-density helium is necessary. In astrophysics, helium is the main component of some stars, and the study of the thermodynamic properties of high-temperature and high-density helium is of great significance for simulating the internal state of stars. Helium is a rare gas and is an inactive element. Normally, it is not easy to generate helium crystals. Not only does it need to convert liquid helium-4 into a solid freezing temperature, but also the liquid helium-4 must be pressurized to at least 25 standard atmospheric pressure. In addition, when the helium crystal grows more than 1 mm, it will be deformed by gravity. Japanese physicists once developed a unique method and broke throu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/02C30B23/00
CPCC30B23/00C30B29/02
Inventor 张宝玲苏雪徐志涛
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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