Dielectric relaxation and conduction mechanism in Aurivillius ceramicBi5Ti3FeO15

Aurivillius ceramic Bi5Ti3FeO15 is a ferroelectric material that exhibits dielectric relaxation and conduction behavior. Dielectric relaxation refers to the process of polarization of the material in response to an applied electric field, while conduction mechanism refers to the flow of current through the material.

Dielectric relaxation in Bi5Ti3FeO15 is due to the movement of charged defects or ions in the crystal lattice. These defects or ions can be either intrinsic, such as oxygen vacancies or extrinsic, such as impurities. The movement of these defects or ions causes a change in the polarization of the material, which results in the dielectric relaxation.

The conduction mechanism in Bi5Ti3FeO15 is mainly due to the oxygen vacancies. The oxygen vacancies act as charge carriers and allow the flow of current through the material. The concentration of oxygen vacancies in the material is dependent on the oxygen partial pressure and temperature. At high temperatures, the oxygen vacancies increase, which results in an increase in the conductivity of the material.

In summary, the dielectric relaxation and conduction mechanism in Aurivillius ceramic Bi5Ti3FeO15 are due to the movement of charged defects or ions and the presence of oxygen vacancies, respectively. These properties make it a promising material for various applications, such as ferroelectric memories and energy storage devices