A novel route to lower the dielectric loss in CaCu$_{3}$Ti$_{4}$O$_{12}$ ceramics

TL;DR

This paper demonstrates a new method to reduce dielectric loss in CaCu$_{3}$Ti$_{4}$O$_{12}$ ceramics by La substitution, supported by impedance spectroscopy analysis, based on the IBLC model.

Contribution

It introduces La-for-Ca substitution as a novel approach to lower dielectric loss in CCTO ceramics, validated by impedance spectroscopy.

Findings

Dielectric loss decreases with La substitution.

Impedance spectroscopy confirms increased grain/subgrain conductivity.

The IBLC model explains the reduction mechanism.

Abstract

Based upon a widely-accepted internal-barrier-layer-capacitance (IBLC) model, the dielectric loss in the giant-dielectric-constant CaCu$_{3}$Ti$_{4}$O$_{12}$ (CCTO) material is expected to decrease as the conductivity of the CCTO grains/subgrains increases. In this letter, we report that this idea was successfully realized through the La-for-Ca substitution in the CCTO ceramics. The impedance spectroscopy analysis gives the evidence.