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Title of Journal: J Mater Sci Mater Electron

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Abbravation: Journal of Materials Science: Materials in Electronics

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Springer US

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DOI

10.1002/hlca.19360190126

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1573-482X

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Giant dielectric and electrical properties of sodi

Authors: Weeraya Somphan Nuchjarin Sangwong Teerapon Yamwong Prasit Thongbai
Publish Date: 2011/11/20
Volume: 23, Issue: 6, Pages: 1229-1234
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Abstract

The electrical properties and dielectric response in Na1/2Y1/2Cu3Ti4O12 ceramic prepared by conventional solidstate reaction method and sintered at 1090 °C for 5 h were investigated as functions of frequency and temperature Main phase of Na1/2Y1/2Cu3Ti4O12 with CaCu3Ti4O12like crystallographic structure and CuO secondary phase were observed in the Xray diffraction pattern Abnormal grain growth was observed just as observed in CaCu3Ti4O12 ceramics The Na1/2Y1/2Cu3Ti4O12 ceramic exhibits a high ε′ of ~204 × 104 at 20 °C and 1 kHz and low tan δ with the minimum 0080 at 5 kHz Impedance spectroscopy analysis reveals that Na1/2Y1/2Cu3Ti4O12 ceramic is electrically heterogeneous consisting of semiconducting grains and insulating grain boundaries Giant ε′ response in Na1/2Y1/2Cu3Ti4O12 ceramic is therefore attributed to an internal barrier layer capacitor effectThis work was supported by the Higher Education Research Promotion and National Research University Project of Thailand Office of the Higher Education Commission through the Advanced Functional Materials Cluster of Khon Kaen University WS would like to thank the Higher Education Research Promotion and National Research University Project of Thailand Office of the Higher Education Commission for her Master Degree scholarship

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