Microstructure and electric characteristics of Na_0.5-xLa_0.5+xCu₃Ti₄O₁₂ ceramics prepared by sol-gel method

Abstract

The Na_0.5-xLa_0.5+xCu₃Ti₄O₁₂ (x = 0.0, 0.1, 0.2, 0.3) ceramics were designed under the condition of unchanged the molar ratio of the component, and were prepared by the sol-gel method. The ceramics showed different microstructure and electrical behaviors with change of La³⁺ and Na⁺ content. The difference might be due to the different defect structure and charge compensation effect. Remarkably, when x = 0.1, the dielectric constant of Na_0.5-xLa_0.5+xCu₃Ti₄O₁₂ ceramics was the highest, and that the second relaxation energy values were smaller than the first relaxation activation energy values, and the conduction activation energy showed a linear area, which were different from other ceramics.

KEYWORDS:

• Activation energy
• charge compensation effect
• complex impedance
• dielectric properties
• dielectric relaxation

Additional information

Funding

This work was supported by the National Science Foundation of China (No. 51172136), the Science Foundation of Shaanxi Province (No. 2017JM2037), the Scientific Research Funds of Education Department (17JK0277) and the Scientific Research Funds of Weinan Normal University (No. 18ZRRC16).