Giant dielectric permittivity of CaCu3Ti4O12 via a green solution-egg white method

被引：10
作者：
Boonlakhorn, Jakkree [1 ]
Chanlek, Narong [2 ]
Thongbai, Prasit [1 ,3 ]
机构：
[1] Khon Kaen Univ, Fac Sci, Dept Phys, Khon Kaen 40002, Thailand
[2] Synchrotron Light Res Inst Publ Org, 111 Univ Ave, Nakhon Ratchasima 30000, Thailand
[3] Khon Kaen Univ, IN RIE, NANOTEC KKU RNN Nanomat Res & Innovat Energy, Khon Kaen 40002, Thailand
来源：
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2020年 / 93卷 / 03期
关键词：
CaCu3Ti4O12 (CCTO); Green solution; Impedance spectroscopy; Loss tangent; Giant; colossal dielectric permittivity; CO-DOPED CACU3TI4O12; ELECTRICAL-PROPERTIES; NONOHMIC PROPERTIES; CERAMICS; MICROSTRUCTURE; SUBSTITUTION; TEMPERATURE; CONSTANT; BEHAVIOR; AL3+;
D O I：
10.1007/s10971-019-05182-1
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：
CaCu3Ti4O12 ceramics were prepared using a green solution-egg white method. A main phase of CaCu3Ti4O12 is observed in the obtained powder and all sintered ceramics. The microstructure of all ceramics is studied. Their grain sizes are found to be in the range of 4-7 mu m. Giant dielectric properties with low dielectric loss (tan delta similar to 0.07) and large dielectric permittivity (epsilon ' similar to 7000) are achieved in the sintered CaCu3Ti4O12 ceramic. An impedance spectroscopy analysis confirms a heterogeneous microstructure in sintered CaCu3Ti4O12 ceramics, consisting of highly resistive grain boundaries and semiconducting grains. Mixed Cu3+/Cu2+/Cu+ and Ti4+/Ti3+ phases are detected using X-ray photoelectron spectroscopy, confirming the presence of semiconducting grains. [GRAPHICS] .
引用
收藏
页码：643 / 649
页数：7
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