Influence of micro- and nanoparticles of zirconium oxides on the dielectric properties of CaCu3Ti4O12

被引:24
作者
Espinoza-Gonzalez, Rodrigo [1 ]
Mosquera, Edgar [1 ,2 ]
机构
[1] Univ Chile, FCFM, Dept Ciencia Mat, Av Beauchef 851, Santiago 8370456, Chile
[2] Univ Valle, Dept Fis, Cali 25360, Colombia
关键词
Dielectric ceramics; Doped CCTO; Impedance spectroscopy; IBLC; CERAMICS; MICROSTRUCTURE; PERMITTIVITY; CONSTANT; DECREASE; BEHAVIOR; PURE;
D O I
10.1016/j.ceramint.2017.07.183
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
This work presents the results of Zr oxide doping of a CaCu3Ti4O12 (CCTO) ceramic prepared by a solid-state reaction. Different stoichiometries (ZrO and ZrO2) and grain sizes (micro- and nanoparticles) were added as dopants at concentrations of 0.5 and 1.0 wt%. Zr-doping controls the grain size growth, leading to a reduction of the grain size as observed by scanning electron microscopy. For both dopant concentrations, all of the samples exhibited lower dielectric loss and a smaller dielectric constant than those of undoped CCTO. The sample doped with 0.5% of the non-stoichiometric ZrO exhibits a dielectric constant over 3200 and a dissipation factor of 0.02 at 1 kHz. The impedance spectroscopy analysis confirms that the decrease of dielectric loss is mainly due to an increase in resistivity at grain boundaries, which is attributed to the suppression of oxygen-loss promoted by dopants.
引用
收藏
页码:14659 / 14665
页数:7
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