Explanation

The phenomenon that charged particles (weak bound ions, ion vacancies, free ions, etc.) in dielectric materials move directionally under the action of an external electric field. In ionic crystal, interstitial cations occur due to unequal displacement or thermal vibration. The ions at the filling position have higher energy than those at the equilibrium position of the lattice node, and are in a metastable state, making them a weakly connected ion. Under the action of an external electric field, these interstitial cations move towards the negative electrode, forming a current. This is why many ionic crystal exhibit conductivity at high temperatures or lower resistivity through doping modification.

Classification