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 22.08.2011   Карта сайта     Language По-русски По-английски
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22.08.2011




Journal of Alloys and Compounds
Volume 509, Issue 35, 1 September 2011, Pages 8716-8719













doi:10.1016/j.jallcom.2011.06.039 | How to Cite or Link Using DOI


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High permittivity and low dielectric loss of the Ca1−xSrxCu3Ti4O12 ceramics


Zupei YangCorresponding Author Contact Information, a, E-mail The Corresponding Author, Lijuan Zhanga, Xiaolian Chaoa, Lirong Xionga and Jie Liua





a Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an 710062, Shaanxi, PR China




Received 21 December 2010;


revised 13 June 2011;


accepted 13 June 2011.


Available online 17 June 2011.












Abstract



The Ca1−xSrxCu3Ti4O12 (CSCTO) giant dielectric ceramics were prepared by conventional solid-state method. X-ray diffraction patterns revealed that a small amount of Sr2+ (x < 0.2) had no obvious effect on the phase structure of the CSCTO ceramics, while with increasing the Sr2+ content, a second phase of SrTiO3 appeared. Electrical properties of CSCTO ceramics greatly depended on the Sr2+ content. The Ca0.9Sr0.1Cu3Ti4O12 ceramics exhibited a higher permittivity (71,153) and lower dielectric loss (0.022) when measured at 1 kHz at room temperature. The ceramics also performed good temperature stability in the temperature range from −50 °C to 100 °C at 1 kHz. By impedance spectroscopy analysis, all compounds were found to be electrically heterogeneous, showing semiconducting grains and insulating grain boundaries. The grain resistance was 1.28 Ω and the grain boundary resistance was 1.31 × 105 Ω. All the results indicated that the Ca0.9Sr0.1Cu3Ti4O12 ceramics were very promising materials with higher permittivity for practical applications.












Highlights



• The Ca1−xSrxCu3Ti4O12 (x = 0, 0.10, 0.15, 0.20, 0.25) giant dielectric ceramics were prepared by conventional solid-state reaction method. • The Ca0.9Sr0.1Cu3Ti4O12 ceramics exhibited a higher permittivity (71,153) and lower dielectric loss (0.022) at 1 kHz at room temperature. • The ceramics also showed good temperature stability from −50 °C to 100 °C at 1 kHz. • By impedance spectroscopy analysis, all compounds were found to be electrically heterogeneous, showing semiconducting grains and insulating grain boundaries. The grain resistance was 1.28 Ω and the grain boundary resistance was 1.31 × 105 Ω.





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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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