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

被引：0
作者：
Jakkree Boonlakhorn
Narong Chanlek
Prasit Thongbai
机构：
[1] Khon Kaen University,Department of Physics, Faculty of Science
[2] 111 University Avenue,Synchrotron Light Research Institute (Public Organization)
[3] Muang District,Institute of Nanomaterials Research and Innovation for Energy (IN–RIE)
[4] NANOTEC–KKU RNN on Nanomaterials Research and Innovation for Energy,undefined
[5] Khon Kaen University,undefined
来源：
Journal of Sol-Gel Science and Technology | 2020年 / 93卷
关键词：
CaCu; Ti; O; (CCTO); Green solution; Impedance spectroscopy; Loss tangent; Giant/colossal dielectric permittivity;
D O I：
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中图分类号：
学科分类号：
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 µm. Giant dielectric properties with low dielectric loss (tanδ ∼ 0.07) and large dielectric permittivity (ε′ ∼ 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.
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页码：643 / 649
页数：6
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