Yoo CS, Cynn H, Soderlind P, Iota V
H-Division, Physics Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
Phys Rev Lett. 2000 May 1;84(18):4132-5. doi: 10.1103/PhysRevLett.84.4132.
We report a new phase transition in cobalt from the magnetic varepsilon(hcp) to a beta(fcc) phase, likely nonmagnetic, at 105 GPa. It occurs martensitically in an extended pressure region between 105 and 150 GPa without any apparent volume change. The fcc phase of Co is in systematic accordance with the 4d and 5d counterparts. The pressure-volume isotherm of beta-Co resembles those of alpha(fcc)-Ni and varepsilon(hcp)-Fe within 1%. The phase diagram of cobalt suggests that the fcc stability increases with increasing occupancy of d-band electrons from Fe to Co to Ni.
我们报告了钴在105吉帕斯卡压力下发生的一种新的相变，从磁性的ε（六方密堆积）相转变为可能非磁性的β（面心立方）相。它在105至150吉帕斯卡的扩展压力区域内以马氏体方式发生，且无明显体积变化。钴的面心立方相与4d和5d对应物系统一致。β - 钴的压力 - 体积等温线与α（面心立方） - 镍和ε（六方密堆积） - 铁的等温线在1%的范围内相似。钴的相图表明，随着d带电子占有率从铁到钴再到镍增加，面心立方相的稳定性增强。
