Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5461099 | Journal of Alloys and Compounds | 2017 | 35 Pages |
Abstract
A total of 5 different half-Heusler alloys, two p-type and two n-type with the fifth a charge compensated alloy have been designed and synthesized. The thermophysical properties of these alloys have been investigated in the range 10 K-1000 K while the magnetic behavior has been studied up to 300 K. The electrical resistivity of all the alloys varies within the range 0.06-5 mΩ cm indicating that they are in the degenerate semiconductor limits. The temperature dependence of p-type alloys exhibits a transition from metallic to semiconducting behavior, typical of topological insulators. The transition is found to occur in the range 300 K-500 K. The n-type and compensated alloys exhibit a weak metallic behavior in the complete temperature range. The Seebeck coefficient in the p-type alloys increases with temperature reaching a maximum value of 50 μV Kâ1 while that of the n-type alloys increases continuously reaching a value of 45 μV Kâ1 at â¼800 K. The corresponding power factor of the n-type alloy reaches 900 μW mâ1 Kâ2 at â¼900 K compared to a maximum of â¼250 μW mâ1 Kâ2 at 700 K for the p-type alloy. Magnetically the p-type and n-type alloys are found to be paramagnetic while the compensated alloy exhibits a ferromagnetic behavior.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Md. Mofasser Mallick, Satish Vitta,