Effect of CuO-TiO sub(2) Eutectic on Thermal and Electrical Conductivities of CaCu sub(3) Ti sub(4) O sub(12) Ceramics

In this work, CaCu sub(x) Ti sub(y) O sub(12) ceramics (2.7 [< or =] x [< or =] 3.3 and 3.25 [< or =] y [< or =] 4.75), related to excess and deficiency of CuO-TiO sub(2) eutectic phase have been synthesized by coprecipitation method. The crystalline phases in the ceramics were identifie...

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Published inMaterials science forum Vol. 881; pp. 117 - 122
Main Authors Goncalves, Flavia dos Reis, Thomazini, Daniel, Gelfuso, Maria Virginia
Format Journal Article
LanguageEnglish
Published 01.11.2016
Subjects
CERAMICS
COPPER OXIDE
Coprecipitation
CUPRIC OXIDE
Electrical conductivity
Electrical resistivity
Eutectic temperature
Heat transfer
PHASE DIAGRAMS
Thermal conductivity
TITANIUM DIOXIDE
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Summary:In this work, CaCu sub(x) Ti sub(y) O sub(12) ceramics (2.7 [< or =] x [< or =] 3.3 and 3.25 [< or =] y [< or =] 4.75), related to excess and deficiency of CuO-TiO sub(2) 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, TiO sub(2) and CaTiO sub(3) 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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ISBN:3035711151
9783035711158
ISSN:0255-5476
1662-9752
DOI:10.4028/www.scientific.net/MSF.881.117