自然界中物质的存在形式及其相应的性质往往取决于其存在条件(如压强、温度和浓度等).存在条件的差异,会使物质的原子排列、晶体结构和电子结构等发生相应的变化,从而呈现出有差异的甚至截然不同的物理特性,如绝缘体-半导体-导体的转变就是一例.由于一般金属具有导电的特性,所 The existing forms of matter in nature and their corresponding properties often depend on their existing conditions (such as pressure, temperature and concentration), the existence of different conditions, will make the material atomic arrangement, the crystal structure and electronic structure corresponding changes, Thus showing different or even very different physical properties, such as the insulator - the transition of the semiconductor - conductor is an example.Because of the general metal with conductive properties,