Gregoryanz Eugene, Lundegaard Lars F, McMahon Malcolm I, Guillaume Christophe, Nelmes Richard J, Mezouar Mohamed
School of Physics and Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3JZ, UK.
Science. 2008 May 23;320(5879):1054-7. doi: 10.1126/science.1155715.
Sodium exhibits a pronounced minimum of the melting temperature at approximately 118 gigapascals and 300 kelvin. Using single-crystal high-pressure diffraction techniques, we found that the minimum of the sodium melting curve is associated with a concentration of seven different crystalline phases. Slight changes in pressure and/or temperature induce transitions between numerous structural modifications, several of which are highly complex. The complexity of the phase behavior above 100 gigapascals suggests extraordinary liquid and solid states of sodium at extreme conditions and has implications for other seemingly simple metals.
钠在大约118吉帕斯卡和300开尔文时呈现出明显的最低熔点。使用单晶高压衍射技术，我们发现钠熔点曲线的最低点与七种不同晶相的聚集有关。压力和/或温度的微小变化会引发众多结构变体之间的转变，其中一些转变非常复杂。超过100吉帕斯卡时相行为的复杂性表明钠在极端条件下具有非凡的液态和固态，这对其他看似简单的金属也有影响。
