论文部分内容阅读
高压下随着压力增加,氧化物及硅酸盐矿物中的阳离子会发生从配位数低的多面体向配位数高的多面体迁移的现象,这种迁移是由于阴阳离子半径的比值发生改变引起的。对SiO2在高压下形成的各种多形的氧和硅的离子半径进行计算,发现氧离子半径是随压力增加及相变的发生而逐渐缩小,但硅离子半径随压力增加及相变的发生而有明显的增大。这种现象可能是在高压下离子化合物逐渐向金属相化合物转变引起的。
With pressure increasing under high pressure, the cations in oxides and silicate minerals migrate from polyhedrons with low coordination numbers to polyhedrons with high coordination numbers due to the change in the ratio of the cation and cation radii of. Calculating the ion radius of various polymorphous oxygen and silicon formed by SiO2 under high pressure, it was found that the radius of oxygen ion decreased with the increase of pressure and the phase transition, but the radius of silicon ion increased with the increase of pressure and the phase change And there is a clear increase. This phenomenon may be caused by the transition of ionic compounds to metal phase compounds under high pressure.