The effects of nano-sized TiO2 and ZnO ceramic inclusions on the high temperature stability of Zn4Sb3 have been studied using multi-temperature synchrotron powder X-ray diffraction. Samples with 9 nm TiO2 nanoinclusions exhibit remarkable stability after three heating cycles to 625 K.
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Thermoelectric (TE) generators have come a long way since the first commercial apparatus launched in the 1950s. Since then, the -ZnSb has manifested its potential as a cost-effective and environmentally friendly TE generator compared with the tellurium-bearing TE materials. Although the -ZnSb features an intrinsically low thermal conductivity , it suffers from a long-lasting structural instability issue arising from the highly mobile zinc ions.
View Article and Find Full Text PDFHigh-Performance and Stable (Ag, Cd)-Containing ZnSb Thermoelectric Compounds.
ACS Appl Mater Interfaces
June 2022
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Binary Zn-Sb-based compounds, ZnSb and ZnSb, are promising thermoelectric (TE) materials because they are low-cost and earth-abundant. However, for a long time, their real applications have been limited by the low TE figure-of-merit () of ZnSb and poor thermodynamic stability of ZnSb. In this study, we successfully integrate both high and good stability in (Ag, Cd)-containing ZnSb compounds.
View Article and Find Full Text PDFStability and Thermoelectric Properties of ZnSb with TiO Nanoparticle Inclusions.
ACS Appl Mater Interfaces
September 2021
Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus, Denmark.
β-ZnSb is a cheap nontoxic high-performance thermoelectric material, which unfortunately suffers from stability issues because of zinc migration in thermal and electrical gradients. Here, the thermoelectric properties and thermal stability of β-ZnSb mixed with varying sizes and weight percentages of TiO nanoparticles are investigated. Furthermore, the stability of pressed β-ZnSb-TiO nanocomposite pellets is investigated by measuring high-energy synchrotron powder X-ray diffraction (PXRD) data during operating conditions using the Aarhus thermoelectric setup (ATOS).
View Article and Find Full Text PDFFirst principles study of defect formation in thermoelectric zinc antimonide, β-Zn4Sb3.
J Phys Condens Matter
April 2015
Department of Energy, Environmental, and Chemical Engineering, Washington University, 1 Brookings Drive, St. Louis, MO 63130, USA.
Understanding the formation of various point defects in the promising thermoelectric material, β-Zn(4)Sb(3), is crucial for theoretical determination of the origins of its p-type behavior and considerations of potential n-type dopability. While n-type conductivity has been fleetingly observed in Te:ZnSb, there have been no reports, to the best of our knowledge, of stable n-type behavior in β-Zn(4)Sb(3). To understand the origin of this difficulty, we investigated the formation of intrinsic point defects in β-Zn(4)Sb(3) density functional theory calculations.
View Article and Find Full Text PDFUnexpected high-temperature stability of β-Zn4Sb3 opens the door to enhanced thermoelectric performance.
J Am Chem Soc
January 2014
State Key Laboratory for Mechanical Behavior of Materials and ‡Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
β-Zn4Sb3 has one of the highest ZT reported for binary compounds, but its practical applications have been hindered by a reported poor stability. Here we report the fabrication of nearly dense single-phase β-Zn4Sb3 and a study of its thermoelectric transport coefficients across a wide temperature range. Around 425 K we find an abrupt decrease of its thermal conductivity.
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