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

被引：4

作者：

Amaral, Filipe ^{[1
,2
,3
]}

Valente, Manuel ^{[2
,3
]}

Costa, Luis Cadillon ^{[2
,3
]}

机构：

[1] Oliveira Hosp, Coll Technol & Management, P-3400124 Oliveira Do Hosp, Portugal

[2] Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal

[3] Univ Aveiro, I3N, P-3810193 Aveiro, Portugal

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2011年 / 208卷 / 10期

关键词：

CaCu3Ti4O12; Cole-Cole relaxation model; colossal dielectric constant; impedance spectroscopy;

D O I：

10.1002/pssa.201000760

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the synthesis and characterization of CaCu3Ti4O12 (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. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2284 / 2287

页数：4

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