Journal ArticleDOI
Temperature Dependence of the Electrical Properties of Bismuth-Antimony Alloys
TLDR
The electrical resistivity and Hall effect of zone-levelled single crystals of Bi-Sb alloys have been measured in the temperature range from 4.2 to 300 K as discussed by the authors.Abstract:
The electrical resistivity $\ensuremath{\rho}$ and Hall effect $R$ of zone-levelled single crystals of Bi-Sb alloys have been measured in the temperature range from 4.2\ifmmode^\circ\else\textdegree\fi{}K to 300\ifmmode^\circ\else\textdegree\fi{}K. $\mathrm{Log}(\frac{\ensuremath{\rho}}{{\ensuremath{\rho}}_{300}})$ vs $\frac{1}{T}$ curves suggest thermal activation of carriers in the concentration range from 5% to 40% Sb in the temperature range from 25\ifmmode^\circ\else\textdegree\fi{}K to 100\ifmmode^\circ\else\textdegree\fi{}K; approximate activation energies have been inferred from their slopes. The activation energy appears to have a maximum at a concentration near 12%. Some anomalies have been observed in the behavior of $\ensuremath{\rho}$ and $R$ on both sides of this concentration at low temperatures. Lattice parameters for these alloys have also been measured for the entire range of solid solubility. Both a maximum and minimum in the $c$-axis lattice parameter vs concentration occur near the concentration at which anomalies appear in transport properties. These phenomena are discussed in terms of a simple band model proposed by Blount and Cohen.read more
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Journal ArticleDOI
New Directions for Low-Dimensional Thermoelectric Materials**
Mildred S. Dresselhaus,Gang Chen,Ming Y. Tang,Ronggui Yang,Hohyun Lee,Dezhi Wang,Zhifeng Ren,Jean-Pierre Fleurial,Pawan Gogna +8 more
TL;DR: In this article, the ability to achieve a simultaneous increase in the power factor and a decrease in the thermal conductivity of the same nanocomposite sample and for transport in the same direction is discussed.
Journal ArticleDOI
High thermoelectric cooling performance of n-type Mg 3 Bi 2 -based materials.
TL;DR: In this article, the authors reported n-type magnesium bismuthide (Mg3Bi2)-based materials with a peak figure of merit (ZT) of 0.9 at 350 kelvin.
Journal ArticleDOI
Transport Properties of Bismuth Single Crystals
TL;DR: The absolute Seebeck coefficient, electrical resistivity, and thermal resistivity were simultaneously measured on pure bismuth single crystals of various orientations between approximately 80° and 300°K.
Journal ArticleDOI
BiSb alloys for magneto-thermoelectric and thermomagnetic cooling
TL;DR: The thermoelectric and thermomagnetic properties of undoped Bi-Sb alloys have been investigated with highly homogeneous single crystals throughout the entire alloy composition as functions of temperature (77-300°K), magnetic field (0-7·5 kilo-oersteds), and crystallographic direction (∥ and ⊥ to the trigonal axis) as mentioned in this paper.
Journal ArticleDOI
Anomalously high thermoelectric figure of merit in Bi1−xSbx nanowires by carrier pocket alignment
TL;DR: In this paper, a band structure phase diagram was generated, showing the dependence of the relative band edge positions on diameter and composition, and the thermoelectric figure-of-merit (ZT) was found for p-type nanowires at 77 K for dW∼40nm and x∼0.13.