Physical properties of CaCu3Ti4O12 obtained from different EDTA-gel derived powders

✍ Scribed by Amaral, Filipe ;Valente, Manuel ;Costa, Luís Cadillon

• Book ID: 105366021
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 368 KB
• Volume: 208
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.201000760

✦ Synopsis

Abstract

We report the synthesis and characterization of CaCu~3~Ti~4~O~12~ (CCTO) powders prepared by two different wet‐chemical methods: ethylenediaminetetraacetic acid‐gel method (EDTA) and modified Pechini (MP) process. In both cases, almost single‐phase CCTO fine powders were obtained from the calcination of the gel precursors at lower temperatures and shorter times than those reported for the conventional solid‐state reaction process. The structure of the calcinated powders and sintered pellets were characterized by X‐ray diffraction and scanning electron microscopy. Impedance spectroscopy measurements were performed on the sintered pellets obtained from the different powders, in the frequency range from 40 Hz to 110 MHz, at room temperature. The results are discussed and compared. High frequency relaxation data was fitted with Cole–Cole model and the calculated relaxation parameters were correlated with morphological and structural properties.