Researchers reach record pressure for solid iron
Iron is the most abundant element in the heart of the earth and the most abundant element in the sixth universe. A key component of terrestrial planets and exoplanets, iron has been one of the most studied materials under extreme conditions. precision tube,cold drawn precision tube,precision steel tube,seamless precision tube,seamless precision steel tube Changzhou Chengxin Metal Products Co., Ltd , https://www.chengxinsteeltube.com
In a series of campaigns, Yuan Yuan Pingan from the laboratory used OMEGA lasers in the Laser Energetics (LLE) laboratory led by the University of Rochester in the United States, and researchers compressed iron up to 5.6 million atmospheres (5.6 million times the pressure on the surface of the earth), solid iron Record pressure. Recording pressure is through multiple shock compressions. Using a series of shocks (rather than a single shock) keeps the material low in entropy compression, which is critical so that the temperature is kept lower than the melting point, thus keeping the iron solid.
Diagnosing the performance of materials under extreme conditions is just as important as creating a high pressure state. The team used X-ray technology called EXAFS (extended X-ray absorption fine structure). EXAFS is a powerful tool widely used in materials science, but materials and their applications are still in their infancy under extreme conditions. This work presents the first high energy density (HED) regardless of EXAFS data. The EXAFS data show that the tightly packed structure of iron is a stable system for exploration, confirming the prediction of simulations and other experimental studies conducted by X-ray diffraction at 30,000 atmospheres.
Surprisingly, the research team found that the peak compression temperature was significantly higher than that from simple compression. The inelastic lattice distortion produced by the extra heat is called plastic work. After a few seconds of rapid compression, the strength of the iron increases, resulting in more plastic work and high temperatures.
"We spent more than two years developing this experimental platform." Ping said. “Now the measurement can expand the scale of larger laser systems, such as national ignition devices, to reach higher pressures, or expand to shorter time scales for HED material research dynamics.â€