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一、概述液氮沸点77.3K至三相点63.1K 的温度可通过减压方法而获得,当温度达到三相点后继减压,由于固相潜热的存在以及固体氮分子不易逸出表面而使温度不再下降,因而液氮减压法最低温度是其三相点温度。但在低温物理研究中,液氮三相点以下的温区是十分诱人的,对这一温区的开拓是很有意义的。液氮三相点以下温区通常是利用液氢或液氦作冷源来获得,
First, an overview of liquid nitrogen boiling point of 77.3K to 63.1K three-phase temperature can be obtained by decompression method, when the temperature reaches three-phase point followed by decompression, due to the existence of solid-phase latent heat and solid nitrogen molecules are not easy to escape from the surface The temperature is no longer declining, so the lowest temperature of liquid nitrogen decompression is its three-phase point temperature. However, in the field of cryogenic physics, the temperature zone below the liquid nitrogen three-phase point is very attractive and makes sense for the development of this temperature zone. Liquid nitrogen three-phase point below the temperature is usually the use of liquid hydrogen or liquid helium as a cooling source to obtain,