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Crystal Structure and Thermoelectric Properties of YAl 3 C 3
Author(s) -
Fukuda Koichiro,
Hisamura Miyuki
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01855.x
Subject(s) - crystal structure , materials science , thermoelectric effect , rietveld refinement , crystallography , hexagonal crystal system , seebeck coefficient , chemistry , thermal conductivity , physics , composite material , thermodynamics
The crystal structure of YAl 3 C 3 was refined from laboratory X‐ray powder diffraction data (Cu K α 1 ) using the Rietveld method. The crystal structure is hexagonal (space group P 6 3 mc , Z =2) with lattice dimensions a =0.342157(4) nm, c =1.72820(1) nm, and V =0.175217(3) nm 3 . The final reliability indices were R wp =9.94% ( R wp / R e =1.18), R p =7.36%, R B =1.77%, and R F =1.03%. The compound shows an intergrowth structure with electroconductive [YC 2 ] thin slabs separated by Al 4 C 3 ‐type [AlC] layers. This material had thermoelectric properties superior to those of the layered carbides Zr 2 [Al 3.56 Si 0.44 ]C 5 , Zr 2 Al 3 C 4 , and Zr 3 Al 3 C 5 in the temperature range of 500– 1073 K, with a maximal power‐factor value of 1.96 × 10 −4 W·(m·K 2 ) −1 at 1073 K.