Synthesis, crystal structure and thermoelectric properties of a new carbide Zr{sub 2}[Al{sub 3.56}Si{sub 0.44}]C{sub 5}
- Department of Environmental and Materials Engineering, Nagoya Institute of Technology, Nagoya 466-8555 (Japan)
- National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560 (Japan)
A new quaternary layered carbide, Zr{sub 2}[Al{sub 3.56}Si{sub 0.44}]C{sub 5}, has been synthesized and characterized by X-ray powder diffraction, transmission electron microscopy 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 of a=0.331059(5), c=4.09450(5) nm and V=0.38864(1) nm{sup 3}. The final reliability indices calculated from the Rietveld refinement were R {sub wp}=6.24%, R {sub p}=4.21% and R {sub B}=0.82%. The crystal structure is composed of electroconductive NaCl-type ZrC slabs separated by Al{sub 4}C{sub 3}-type [Al{sub 3.56}Si{sub 0.44}]C{sub 3} layers. This material had thermoelectric properties superior to those of the ternary layered carbides Zr{sub 2}Al{sub 3}C{sub 4} and Zr{sub 3}Al{sub 3}C{sub 5}, with the power factor reaching 7.6x10{sup -5}W m{sup -1} K{sup -2}. - Graphical abstract: Crystal structure of a new layered carbide, Zr{sub 2}[Al{sub 3.56}Si{sub 0.44}]C{sub 5}.
- OSTI ID:
- 21015841
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 6; Other Information: DOI: 10.1016/j.jssc.2007.04.004; PII: S0022-4596(07)00137-5; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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