离子化合物在常温下都是固体是一个众所周知的常识。这是由于离子键是很强的化学键．而且没有方向性和饱和性，大量的正负离子同时存在时，强大的离子键使它们彼此靠拢，尽可能地利用空间，而且，总是取230种空间群对称性之一，形成具有平移对称性的固体，所有离子只能原地振动 It is a well-known fact that ionic compounds are all solids at ambient temperatures. This is because the ionic bond is a strong chemical bond. And there is no direction and saturation, a large number of positive and negative ions exist at the same time, a strong ionic bond so that they move closer to each other to make full use of space, and always take 230 kinds of space group symmetry, the formation of a translational symmetry Solid, all ions vibrate only in situ