Fabrication Of Zn4Sb3 Alloys By A Combination Of Gas-Atomization And Spark Plasma Sintering Processes

Abstract

In this study, single phase polycrystalline Zn 4 Sb 3 as well as 11 at.% Zn-rich Zn 4 Sb 3 alloy having ε-Zn 4 Sb 3 (majority phase) and Zn (minority phase) phases bulk samples produced by gas-atomization and subsequently consolidated by spark plasma sintering (SPS) process. The crystal structures were analyzed by X-ray diffraction (XRD) and cross-sectional microstructure were observed by the scanning electron microscopy (SEM). The internal grain microstructure of 11at.% Zn-rich Zn 4 Sb 3 powders shows lamellar structure. Relative density, Vickers hardness and crack lengths were measured to investigate the effect of sintering temperature of Zn 4 Sb 3 samples which are sintered at 653, 673 and 693 K. Relative density of the single phase bulk Zn 4 Sb 3 sample reached to 99.2% of its theoretical density. The micro Vickers hardness of three different sintering temperatures were found around 2.17 -2.236 GPa.

High Thermoelectric Performance and Oxidation Resistance of (Na, Ga) Codoped β-Zn4Sb3 Thermoelectric Materials Prepared by the NaCl Flux

“…Although β-Zn 4 Sb 3 is an excellent TE material, its conversion efficiency still fails to meet the requirements for commercial applications presently; therefore, many strategies have been adopted to synthesize and improve the ZT value. The synthesis methods of β-Zn 4 Sb 3 include hot pressing, , spark plasma sintering (SPS), − mechanical alloy powder synthesis (MA), , etc. Some elements are used for doping to improve TE performance, which contains Cd, Al, Cu, and Te. , However, β-Zn 4 Sb 3 synthesized by the above methods has numerous cracks in the crystal due to the presence of Zn secondary phases .…”

Influence of Nanoparticle Processing on the Thermoelectric Properties of (BixSb1−X)2Te3 Ternary Alloys

“…TE materials can therefore be used in a wide range of technical applications which include power generators, cooling devices, IR detectors, and gas sensors. [2][3][4][5] The energy conversion efficiency of a thermoelectric material is typically represented by the dimensionless figure-ofmerit zT = (α 2 σT/k), where α is the Seebeck coefficient, σ the specific electrical conductivity, T the absolute temperature in Kelvin, and k the thermal conductivity as the sum of the electronic k el and lattice k L contributions. [1,[6][7][8][9] In order to achieve a high thermoelectric figure-of-merit, the material of interest must exhibit a sufficiently large Seebeck coefficient, a high electrical conductivity, and a low thermal conductivity.…”

Hydrothermal method for the synthesis of Sb2Te3, and Bi0.5Sb1.5Te3 nanoplates and their thermoelectric properties

“…Thermoelectric (TE) materials are those that can directly convert waste heat to electrical energy via the Seebeck effect, or electrical to heat exclusion by Peltier effect, in an eco-friendly manner and suitable for various challenging applications such as cooling devices, micro-heat exchangers for laser diodes, infrared detectors, and sensors. [1][2][3][4] The materials performance is determined by dimensionless figure of merit ZT, defined as ZT=S 2 rT/j, where S is the Seebeck coefficient, r is the electrical conductivity, j is the thermal conductivity, and T is the absolute temperature. 5 The thermoelectric power generating efficiency g p and cooling efficiency g c are defined as a function of average ZT (ZT ave ), 6,7…”