McMahon M I, Nelmes R J, Rekhi S
Department of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom.
Phys Rev Lett. 2001 Dec 17;87(25):255502. doi: 10.1103/PhysRevLett.87.255502. Epub 2001 Nov 30.
The structure of Cs-III, stable between 4.2 and 4.3 GPa at room temperature, has been determined from single-crystal x-ray diffraction data. Rather than the simple fcc structure previously reported [Hall et al., Science 146, 1297 (1964)], the data yield a complex new type of elemental structure which is orthorhombic (space group C222(1)) with 84 atoms in the unit cell. No evidence could be found for the fcc form reported previously, even in a further experiment, conducted under conditions close to those used by Hall et al., which also yielded the 84-atom structure.
室温下在4.2至4.3吉帕斯卡之间稳定的Cs-III结构，已通过单晶X射线衍射数据确定。与之前报道的简单面心立方结构[霍尔等人，《科学》146, 1297 (1964)]不同，这些数据产生了一种复杂的新型元素结构，它是正交晶系（空间群C222(1)），晶胞中有84个原子。即使在进一步的实验中，在接近霍尔等人所使用的条件下进行，该实验也得到了84原子结构，但仍未找到之前报道的面心立方形式的证据。
