Under high pressure, "impossible new compounds" are born

In recent years, theoretical research and experiments have shown that elements can form new compounds which are impossible to exist in classical chemistry under high pressure On March 30, it was learned from Beijing high pressure science research center that Li Kuo, a researcher of the center, and Chen Yue, a professor of Hong Kong University, cooperated to synthesize a new compound sn3se4, which is against the common valence, for the first time The compound is metallic and will turn into superconductor at low temperature, and may have better physical properties The results were published in the physics review letters, the world's top academic journal of physics, on the 28th As a dimension as important as temperature, pressure changes the structure of matter by changing the atomic distance and charge distribution, forming a high-pressure phase with new properties For example, scientists predict that under high pressure, hydrogen will show the characteristics of metallic state - conductivity In recent years, scientists have found that high pressure can also change the valence of elements Some compounds that cannot exist under normal pressure can be synthesized and exist stably under high pressure, which constantly subverts our cognition of the original chemical knowledge Li Kuo said that Sn se system compounds have good properties in photoelectric, thermoelectric, storage conversion In general, only two compounds, snse and snse 2, can be observed? Li Kuo and his team's Dr Wang Lijuan confirmed the synthesis of the new compound sn3se4 with X-ray diffraction data under the condition of 160000 atmospheric pressure and 925 ℃ "It's like water is hydrogen dioxygen one, and hydrogen peroxide is hydrogen dioxygen two If you have one more oxygen, you can disinfect Do you have hydrogen dioxygen or hydrogen dioxygen? In the SN se system, we used 160000 atmospheric pressure "flood force" to get sn3se4 This actually tells us that the four or six main group elements can form more new compounds that the ghost doesn't know about " Li Kuo said.