Paper Title:
Giant Dielectric Response in Perovskite-Derivative CaCu3Ti4O12 Prepared by Polymerized Complex Method
  Abstract

Nano-sized powders of CaCu3Ti4O12 (crystallite size of 44, 58 and 71 nm) have been synthesized by a polymerized complex method, followed by calcination the synthesized precursor at 600, 700 and 800°C in air for 8h. The CaCu3Ti4O12 powders were then characterized by XRD, FTIR and SEM. Sintering of the powders was conducted in air at 1100°C for 16h. The XRD results confirmed a typical perovskite CaCu3Ti4O12 structure in all the sintered ceramics, although the presence of a second phase of CaTiO3 was observed in the sample sintered using the powders calcined at 600°C. Microstructure of the sintered CaCu3Ti4O12 ceramics was observed by SEM and the grain size of the materials evaluated with polished using the line intercept method were found to be ~ 10-20 μm. A giant frequency-dependent dielectric constant samples (ε ~10000-60000) with weakly temperature dependence and was observed in the all the samples. The highest dielectric constant of the material was found to be ~60000 (at 140-160°C, 100 Hz) in the sample sintered using the powders calcined at 700°C. The origin of the high permittivity observed in these CaCu3Ti4O12 ceramics is attributed to the Maxwell-Wagner polarization mechanism.

  Info
Periodical
Edited by
P. VINCENZINI
Pages
2345-2350
DOI
10.4028/www.scientific.net/AST.45.2345
Citation
C. Masingboon, P. Thongbai, S. Maensiri, "Giant Dielectric Response in Perovskite-Derivative CaCu3Ti4O12 Prepared by Polymerized Complex Method", Advances in Science and Technology, Vol. 45, pp. 2345-2350, 2006
Online since
October 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hua Jun Sun, Wen Chen, Qing Xu, Jing Zhou, Xiao Fang Liu
Abstract:Using Zr(NO3)4.5H2O as Zr source, PZT powder with a single-phase perovskite structure was synthesized by a sol-autocombustion method at a...
219
Authors: T. Yoshifuji, Kenichi Kakimoto, Hitoshi Ohsato
Abstract:Dense KBa2Nb5O15 ceramics have been first prepared from the accurate treatment of powder mixing under ordinary pressure-less sintering. The...
113
Authors: Jing Pei, Zhen Xing Yue, Fei Zhao, Zhi Lun Gui, Long Tu Li
Abstract:The nano-sized Ba(Zr0.2Ti0.8)O3 powder was prepared by citrate sol-gel method. The crystal structure and the particle size of the powder...
76
Authors: Wandee Thamjaree, Wim Nhuapeng, Tawee Tunkasiri
Abstract:In this work, barium zirconium titanate (BZT) ceramics were fabricated by using a ultrasonic ball milling technique. BZT with the ratio of...
213
Authors: Yi Hang Fang, Kai Miao, Si Qiao Feng, Jia Meng Cao, Huan Ping Wang, Shi Qing Xu
Chapter 7: New Materials and its Applications
Abstract:The 0.95MgTiO3-0.05CaTiO3 (95MCT) powders and ceramics were prepared by a sol-gel method by using...
923