Jilin University Research Project won the National Natural Science Award
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(a) hP4 structure diagram of insulator sodium under high pressure; (b) differential charge density diagram of insulator sodium under high pressure, the valence electron of sodium is bound to the lattice gap by the coulomb repulsion of the core electron, unable to move freely, sodium Lost metal properties.
Metallic sodium has a metallic luster at 1.1 million atmospheres, becomes black at 1.3 million atmospheres, and becomes transparent at 2 million atmospheres. (The above picture is provided by the State Key Laboratory of Superhard Materials of Jilin University)
Ma Yuming, Distinguished Professor of Changjiang Scholars at Jilin University, winner of the National Outstanding Youth Fund, and project leader, said that the same material will have a brand new “unknown world†under different high pressure conditions, and once it becomes a new structure. Will have new features and properties.
"Many non-conductive materials that are well known today become conductors under high enough pressure. This basic law has been widely accepted and accepted. But after years of research, we have discovered an inverse phenomenon. Very conductive. A good metal nano can become a transparent insulator under high pressure, that is, from 'conducting' to 'non-conducting'. It can be said that this discovery provides an anti-traditional understanding of people's cognition."
In Ma Yingming's view, the universe and the interior of the Earth are in a state of high pressure. This study is of great significance for understanding the behavior of some substances under high pressure, especially for the study of the structure of stars and the interior of the Earth. “To understand the composition and structure of the stars and the interior of the Earth, high-pressure research must be carried out. From a scientific point of view, this discovery solves a major problem in the field of high-voltage extreme conditions physics research. The materials in the project are under high pressure conditions. All kinds of changes will also be a window for us to snoop on the structure of the universe."
It is understood that the project's core content of the project in the development process "Transparent dense sodium" (Chinese translation: transparent dense metal sodium) was published in 2009 in the international authoritative journal "Nature" (Nature), which is also Jilin University Since the founding of the school, the first paper published in the journal Nature.
In addition, the results were also selected in the 2009 China Basic Research Top Ten News and 2010 National “Eleventh Five-Year†Major Science and Technology Achievement Exhibition, which was cited by international peers as an example of new phenomena and new effects under high pressure, written in the 21st century in the United States. Summary report of the seminar on the needs and challenges of compression science. (Finish) 