Decrease of dielectric loss in CaCu3Ti4O12ceramics by La doping

✍ Scribed by Feng, Lixin ;Tang, Xiaoming ;Yan, Yueyue ;Chen, Xuezhi ;Jiao, Zhengkuan ;Cao, Guanghan

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 272 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200622038

✦ Synopsis

Abstract

We have developed a novel route to reduce the dielectric loss of CaCu~3~Ti~4~O~12~ (CCTO) material based on the internal‐barrier‐layer‐capacitance (IBLC) model. By the partial La‐for‐Ca substitution the dielectric loss was suppressed re‐markably while the giant dielectric constant still remains. The sample of Ca~0.8~La~0.2~Cu~3~Ti~4~O~12~ exhibits a high dielectric con‐ stant over 3000 and a low dissipation factor below 0.015 at 10 kHz from 180 K to 300 K. The impedance spectroscopy analysis confirms that the decrease of dielectric loss is mainly due to the increase of conductivity in the CCTO grain/subgrain. Our result is expected to be able to promote practical applications. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)