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Updated: Aug 3, 2025

Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
Published on: May 15, 2015
A simulation study on the phase transition behavior of solid nitrogen under extreme conditions
Han Qin1, Sheng-Hai Zhu2, Zhen Jiao3
1School of Science, Key Laboratory of High Performance Scientific Computation, Xihua University, Chengdu 610039, China.
Abstract:
There are numerous examples of materials that exhibit interesting phenomena at extremely low temperatures, but the difficulty of obtaining absolute zero at high pressure in experiments is sometimes a hurdle to reveal the exact explanation of these low temperature phenomena. Based on the calculations of the phonon spectrum and Gibbs free energy of α-N2 and γ-N2 under different pressures, we found that solid nitrogen at 0 K showed a re-entrant phase transition under continuously increasing pressure. The extremely low temperature in this pressure range turned out to be the main external condition for inducing phase transition as well as phase reversal.
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