Effect of CuO-TiO2 Eutectic on Thermal and Electrical Conductivities of CaCu3Ti4O12 Ceramics

Flavia dos Reis Gonçalves; Daniel Thomazini; Maria Virginia Gelfuso

doi:10.4028/www.scientific.net/MSF.881.117

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HomeMaterials Science ForumMaterials Science Forum Vol. 881Effect of CuO-TiO2 Eutectic on Thermal and...

Effect of CuO-TiO₂ Eutectic on Thermal and Electrical Conductivities of CaCu₃Ti₄O₁₂ Ceramics

Abstract:

In this work, CaCu_xTi_yO₁₂ ceramics (2.7 ≤ x ≤ 3.3 and 3.25 ≤ y ≤ 4.75), related to excess and deficiency of CuO-TiO₂ eutectic phase have been synthesized by coprecipitation method. The crystalline phases in the ceramics were identified by X-ray diffraction patterns, and the pellets have mainly presented CCTO and also exhibited CuO, TiO₂ and CaTiO₃ as secondary phases. The thermal conductivity of the ceramics was determined using the laser flash method in the temperature range of 300-1000 K. It was observed a decrement in thermal conductivity values as the amount of the eutectic phase decreased. The electrical DC conductivity has been measured by the two-probe method from 300-1000 K and it has been noted that both grain size and amount of eutectic phase influenced the electrical conductivity results.

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Periodical:

Materials Science Forum (Volume 881)

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117-122

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https://doi.org/10.4028/www.scientific.net/MSF.881.117

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Online since:

November 2016

Authors:

Flavia dos Reis Gonçalves, Daniel Thomazini, Maria Virginia Gelfuso

Keywords:

CaCu₃Ti₄O₁₂, Electrical Conductivity, Thermal Conductivity

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