Effect of partial substitution of Ca for Al on the microstructure and high-temperature thermoelectric properties of CuAlO2
Creators
- 1. Department of Advanced Materials Engineering, Sejong University, Seoul 143-747 (Korea, Republic of)
- 2. Korea Institute of Ceramic Engineering and Technology, Seoul 153-023 (Korea, Republic of)
Description
The sintered CuAl1-xCaxO2 (0-bar x-bar 0.2) bodies contained the CuAl1-xCaxO2 solid solution with a rhombohedral structure, R3-bar m, along with second phases such as CuO, CaO, Ca3Al2O6, and CaAl4O7 phases. It was found that, as the amount of Ca in the CuAl1-xCaxO2 samples increased, the grain size increased from 0.94 to 3.01μm and the porosity decreased from 29.3 to 6.8%. The substitution of Ca up to x=0.1 for Al in the CuAl1-xCaxO2 samples gave rise to an increase in both the electrical conductivity and the Seebeck coefficient. On the other hand, the higher Ca substitution (x>=0.15) decreased both the electrical conductivity and the Seebeck coefficient. The highest value of power factor (7.82x10-5Wm-1K-2) was attained for CuAl0.9Ca0.1O2 at 1140K. We demonstrate that the Ca substitution is highly effective for enhancing high-temperature thermoelectric properties
Additional details
Identifiers
- DOI
- 10.1016/j.mseb.2005.10.035;
- PII
- S0921-5107(05)00756-7;
Publishing Information
- Journal Title
- Materials Science and Engineering. B, Solid-State Materials for Advanced Technology
- Journal Volume
- 129
- Journal Issue
- 1-3
- Journal Page Range
- p. 1-7
- ISSN
- 0921-5107
- CODEN
- MSBTEK
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 37120867
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- ALUMINIUM OXIDES; CALCIUM OXIDES; CONCENTRATION RATIO; COPPER OXIDES; ELECTRIC CONDUCTIVITY; GRAIN SIZE; POROSITY; POWER FACTOR; SOLID SOLUTIONS; TEMPERATURE DEPENDENCE; THERMOELECTRIC PROPERTIES; TRIGONAL LATTICES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; ALUMINIUM COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIMENSIONLESS NUMBERS; DISPERSIONS; ELECTRICAL PROPERTIES; HOMOGENEOUS MIXTURES; MICROSTRUCTURE; MIXTURES; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SIZE; SOLUTIONS; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Copyright
- Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.