Synthesis of CaCu3Ti4O12 powders and ceramics by sol-gel method using decanedioic acid and its dielectric properties
来源期刊：中南大学学报(英文版)2012年第12期
论文作者：WANG Mao-hua(王茂华) ZHOU Fu(周芙) WANG Qiu-li (王秋丽) YAO Chao(姚超)
文章页码：3385 - 3389
Key words：CaCu3Ti4O12; sol-gel method; decanedioic acid; permittivity
Abstract: The CaCu3Ti4O12 xerogels, powders and ceramics were prepared through the sol-gel method using two kinds of organic acid (decanoic acid and decanedioic acid). The xerogels, powders and ceramics were characterized by the methods of TG-DTG, FT-IR, XRD, SEM and TEM. The dielectric properties of the ceramics were also measured. The results indicated that the powders calcined at 850 ºC for 2 h are both nanometer scale particles. After sintering, the ceramics mainly consist of the CaCu3Ti4O12 phase. Compared with the powders prepared using monoacid, the particle size of the powders prepared using diacid obviously increases, and the grain size, the relative density and the whole permittivity of the ceramics increase as well. Specially, the ceramic prepared using decanedioic acid has higher relative density (97.3%), dielectric constant (316 808) and lower dielectric loss (0.242 5) at 30 ºC (10 kHz)
WANG Mao-hua(王茂华), ZHOU Fu(周芙), WANG Qiu-li (王秋丽), YAO Chao(姚超)
(School of Petrochemical Technology, Changzhou University, Changzhou 213164, China)
Abstract:The CaCu3Ti4O12 xerogels, powders and ceramics were prepared through the sol-gel method using two kinds of organic acid (decanoic acid and decanedioic acid). The xerogels, powders and ceramics were characterized by the methods of TG-DTG, FT-IR, XRD, SEM and TEM. The dielectric properties of the ceramics were also measured. The results indicated that the powders calcined at 850 ºC for 2 h are both nanometer scale particles. After sintering, the ceramics mainly consist of the CaCu3Ti4O12 phase. Compared with the powders prepared using monoacid, the particle size of the powders prepared using diacid obviously increases, and the grain size, the relative density and the whole permittivity of the ceramics increase as well. Specially, the ceramic prepared using decanedioic acid has higher relative density (97.3%), dielectric constant (316 808) and lower dielectric loss (0.242 5) at 30 ºC (10 kHz)
Key words:CaCu3Ti4O12; sol-gel method; decanedioic acid; permittivity
