Synthesis, crystal structure, and thermoelectric properties of a new layered carbide (ZrC)3[Al3.56Si0.44]C3

Abstract

A new quaternary layered carbide, (ZrC)3[Al3.56Si0.44]C3, has been synthesized and characterized by x-ray powder diffraction and thermopower and electrical conductivity measurements. The crystal structure was successfully determined using direct methods and further refined by the Rietveld method. The crystal is trigonal (space group R3m*, Z = 3) with lattice dimensions a = 0.331389(7), c = 4.90084(7) nm, and V = 0.46610(1) nm3. The final reliability indices calculated from the Rietveld refinement were Rwp = 9.53% (S = 1.70), Rp = 7.22%, RB = 1.81%, and RF = 0.94%. The crystal structure is composed of the NaCl-type [Zr3C4] slabs separated by the Al4C3-type [Al0.89Si0.11C] layers. This material had thermoelectric properties comparable to the layered carbides (ZrC)2[Al3.56Si0.44]C3 (Zr2[Al3.56Si0.44]C5), (ZrC)2Al3C2, and (ZrC)3Al3C2 in the temperature range of 373–1273 K, with the maximal power-factor value of 6.6 × 10−5 W m−1K−2 at 545 K. The two quaternary carbides have been found to form a homologous series with the general formula of (ZrC)n[Al3.56Si0.44]C3 (n = 2 and 3).

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Acknowledgments

Supported by a Grant-in-Aid for Scientific Research (No. 18560654) from the Japan Society for the Promotion of Science and by a grant from the Thermal and Electric Energy Technology Foundation, Japan.

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Correspondence to Koichiro Fukuda.

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Fukuda, K., Hisamura, M., Kawamoto, Y. et al. Synthesis, crystal structure, and thermoelectric properties of a new layered carbide (ZrC)3[Al3.56Si0.44]C3. Journal of Materials Research 22, 2888–2894 (2007). https://doi.org/10.1557/JMR.2007.0372

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