Dielectric properties of polycrystalline ZnS

The temperature and frequency dependences of the permittivity of polycrystalline zinc sulfide are investigated. The permittivity is calculated from the electronic-structure parameters. It is shown that an increase in the permittivity at frequencies below 10 kHz occurs as a result of space-charge polarization, which is due to the presence of charged dislocations in interlayer and grain boundaries.