Adapting BaTiO₃-based relaxor ferroelectrics for electrocaloric application

ABSTRACT

In this work, we attribute the ferroelectric-relaxor crossover in BaTiO₃-based solid solution to the percolation of the BO₆ octahedra occupied by solute atoms. BaTiO₃-based solid solutions which are favorable for electrocaloric applications possess then a composition in the vicinity of the ferroelectric-relaxor crossover. For the first time, we consider a beneficial range of operational temperatures of EC devices based on these materials.

KEYWORDS:

• Relaxor ferroelectrics
• electrocaloric effect
• temperature dependence of dielectric permittivity

Funding

This work was supported by the German Research Foundation (DFG) within the Priority Program “Ferroic Cooling” (SPP1599, project B6).