Abstract
We first measured the thermoelectric properties of layer-structured homologous compounds, (ZnO)mIn2O3 (m = integer), and reported that they would becomecandidate materials for high-temperature thermoelectric energy conversion.1–4 We further tried to improve their thermoelectric properties by partially substituting yttrium for indium in (ZnO)5In2O3. Though the ionic radius of Y3+ is larger than that of In3+, the a-axis (hexagonal system) elongated and c-axis shrank as Y was substituted for In. The thermoelectric properties were found to vary with a varying amount of Y substitution; 3% Y substitution gave rise to the largest thermoelectric figure of merit, i.e., 1.1 - 1.3 × 10-4 K-1 at 960–1100 K. The abnormal change in the lattice structure by Y substitution was responsible for the unusual behavior of the thermoelectric properties.
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Kazeoka, M., Hiramatsu, H., Seo, WS. et al. Improvement in thermoelectric properties of (ZnO)5In2O3 through partial substitution of yttrium for indium. Journal of Materials Research 13, 523–526 (1998). https://doi.org/10.1557/JMR.1998.0067
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DOI: https://doi.org/10.1557/JMR.1998.0067