Thermoelectric properties of Ce x Nd y Co4Sb12 skutterudites

Experimental results of studying the thermoelectric properties of Co₄Sb₁₂, Ce_0.1Nd_0.5Co₄Sb₁₂, and Ce_0.5Nd_0.1Co₄Sb₁₂ prepared by induction melting are presented. The thermoelectric figure of merit ZT of the studied Co₄Sb₁₂ is approximately two times higher than ZT of unfilled skutterudites prepared by the conventional solid-phase synthesis method. The figure of merit of Ce_0.1Nd_0.5Co₄Sb₁₂ and Ce_0.5Nd_0.1Co₄Sb₁₂ appears lower than ZT of Co₄Sb₁₂ due to the presence of an impurity phase of metal antimony in the first two samples. It is assumed that the thermoelectric properties of filled skutterudites can be significantly improved by optimizing the induction melting method.

     

Effect of Praseodymium and Lanthanum Substitution for Bismuth on the Thermoelectric Properties of BiCuSeO Oxyselenides

Semiconductors - The  results  of  investigating  the  thermoelectric  properties of the bulk р-type oxyselenides Bi1 –xPrxCuSeO (x...     

Influence of V Doping on the Thermoelectric Properties of Fe2Ti1 –xVxSn Heusler Alloys

Semiconductors - The results of experimental investigation into Fe2Ti1 –xVxSn alloys (x = 0, 0.06, 0.15, and 0.2) are presented. It is established from the temperature dependences of the...     

Fe-based semiconducting Heusler alloys

A brief overview of the current state of research on Fe-based semiconducting Heusler alloys is given. The most significant achievement in this area is the increase of thermoelectric figure of merit to ZT > 1 in the p-type Fe(V,Nb)Sb-based compounds. Besides these compounds, growing attention has been paid in recent years to the study of promising thermoelectric materials based on Fe₂TiZ (Z = Al, Si, Sn) Heusler alloys and the investigation of multifunctional Fe₂MnZ (Z = Al, Si) compounds, which may be of interest as thermoelectric materials as well as magnetic semiconductors with a high Curie temperature.     

Electrical Transport Properties of Nb and Ga Double Substituted Fe2VAl Heusler Compounds

Semiconductors - In this work the results of studying the electrical transport properties of Fe2V1 –xNbxAl1 –yGay (0.1 ≤ x ≤ 0.2 and 0.1 ≤ y ≤ 0.2) are...     

Flexible Thermoelectric Polymer Composites Based on a Carbon Nanotubes Forest

Polymer‐based composites are of high interest in the field of thermoelectric (TE) materials because of their properties: abundance, low thermal conductivity, and nontoxicity. In applications, like TE for wearable energy harvesting, where low operating temperatures are required, polymer composites demonstrate compatible with the targeted specifications. The main challenge is reaching high TE efficiency. Fillers and chemical treatments can be used to enhance TE performance of the polymer matrix. The combined application of vertically aligned carbon nanotubes forest (VA‐CNTF) is demonstrated as fillers and chemical post‐treatment to obtain high‐efficiency TE composites, by dispersing VA‐CNTF into a poly (3,4‐ethylenedioxythiophene) polystyrene sulfonate matrix. The VA‐CNTF keeps the functional properties even in flexible substrates. The morphology, structure, composition, and functional features of the composites are thoroughly investigated. A dramatic increase of power factor is observed at the lowest operating temperature difference ever reported. The highest Seebeck coefficient and electrical conductivity are 58.7 µV K^?1 and 1131 S cm^?1, respectively. The highest power factor after treatment is twice as high in untreated samples. The results demonstrate the potential for the combined application of VA‐CNTF and chemical post‐treatment, in boosting the TE properties of composite polymers toward the development of high efficiency, low‐temperature, flexible TEs.     

Inverse Magnetocaloric Effect and Kinetic Arrest Behavior in As-Cast Gd2In at Cryogenic Temperatures

Journal of Superconductivity and Novel Magnetism - The magnetocaloric effect (MCE) in samples of the Gd2In compound has been studied by the direct method in temperature range of...     

Theoretical Modeling of the Thermoelectric Properties of Fe2Ti1 –xVxSn Heusler Alloys

Semiconductors - Theoretical calculations of the electron structure and Seebeck coefficient in Fe2Ti1 –xVxSn alloys for the cases of a fully ordered L21 and partially disordered B2 Heusler...