Physics – Condensed Matter – Materials Science
Scientific paper
2004-12-13
J. Appl. Phys. 96 (2004) 7338 - 7345
Physics
Condensed Matter
Materials Science
to be published in J. Appl. Phys.22 pages, 8 figures
Scientific paper
10.1063/1.1808248
Loosely packed granular materials are intensively studied nowadays. Electrical and thermal transport properties should reflect the granular structure as well as intrinsic properties. We have compacted crystalline $CaAl$ based metallic grains and studied the electrical resistivity and the thermoelectric power as a function of temperature ($T$) from 15 to 300K. Both properties show three regimes as a function of temperature. It should be pointed out : (i) The electrical resistivity continuously decreases between 15 and 235 K (ii) with various dependences, e.g. $\simeq$ $T^{-3/4}$ at low $T$, while (iii) the thermoelectric power (TEP) is positive, (iv) shows a bump near 60K, and (v) presents a rather unusual square root of temperature dependence at low temperature. It is argued that these three regimes indicate a competition between geometric and thermal processes, - for which a theory seems to be missing in the case of TEP. The microchemical analysis results are also reported indicating a complex microstructure inherent to the phase diagram peritectic intricacies of this binary alloy.
Ausloos Marcel
Cloots Rudi
Latuch J.
Mucha Jan
Pekala Marek
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