3篇
您的检索式：作者名="Umut Aydemir"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Grain boundary engineering with nano-scale InSb producing high performance In_(x)Ce_(y)Co_(4)Sb_(12+z)skutterudite thermoelectrics显示文摘Thermoelectric semiconductors based on CoSb_(3)hold the best promise for recovering industrial or automotive waste heat because of their high efficiency and relatively abundant,lead-free constituent elements.However,higher efficiency is needed before thermoelectrics reach economic viability for widespread use.In this study,n-type In_(x)Ce_(y)Co_(4)Sb_(12+z)skutterudites with high thermoelectric performance are produced by combining several phonon scattering mechanisms in a panoscopic synthesis.Using melt spinning followed by spark plasma sintering(MS-SPS),bulk In_(x)Ce_(y)Co_(4)Sb_(12+z)alloys are formed with grain boundaries decorated with nano-phase of InSb.The skutterudite matrix has grains on a scale of 100-200 nm and the InSb nano-phase with a typical size of 5e15 nm is evenly dispersed at the grain boundaries of the skutterudite matrix.Coupled with the presence of defects on the Sb sublattice,this multi-scale nanometer structure is exceptionally effective in scattering phonons and,therefore,InxCey-Co_(4)Sb_(12)/InSb nano-composites have very low lattice thermal conductivity and high zT values reaching in excess of 1.5 at 800 K. | Han Li Xianli Su Xinfeng Tang Qingjie Zhang Ctirad Uher G.Jeffrey Snyder Umut Aydemir | 2017 | Journal of Materiomics2017，3，4： | 7 |
| 2 | Ultrahigh figure-of-merit of Cu2Se incorporated with carbon coated boron nanoparticles显示文摘Cu2Se based thermoelectric materials are of great potential for high-temperature energy harvesting due to their high-temperature figure-of-merit(zT).For further development of Cu2Se,both engineering and mid-temperature figure-of-merit need to be improved.In this work,we report that carbon-coated boron(C/B)nanoparticles incorporation can significantly improve both mid-and high-temperature zT in Cu2Se.The nanoparticle inclusions can result in a homogeneous distribution of Cu:C:B interfaces responsible for both improvement of the Seebeck coefficient and significantly reduction in thermal conductivity.Ultrahigh mid-and high temperature thermoelectric performance with zT=1.7 at 700 K and 2.23 at 1000 K as well as significantly improved engineering zT are achieved in the C/B incorporated Cu2Se with desirable mechanical properties and cycling stability.Our findings will stimulate further study and exploration for the Cu2Se based thermoelectric materials for broad applications in converting waste heat to electricity with competitive energy conversion efficiency. | Meng Li Sheik MdKazi Nazrul Islam Mujde Yahyaoglu Deng Pan Xun Shi Lidong Chen Umut Aydemir Xiaolin Wang | 2019 | InfoMat2019，1，1： | 0 |
| 3 | Intrinsic mechanical behavior of MgAgSb thermoelectric material:An ab initio study显示文摘α-MgAgSb based thermoelectric(TE)device attracts much attention for its commercial application because it shows an extremely high conversion efficiency of ~8.5% under a temperature difference of 225 K.However,the mechanical behavior of α-MgAgSb is another serious consideration for its engineering applications.Here,we apply density functional theory(DFT)simulations to examine the intrinsic mechanical properties of all three MgAgSb phases,including elastic properties,shear-stress-shear-strain relationships,deformation and failure mechanism under ideal shear and biaxial shear conditions.We find that the ideal shear strength of α-MgAgSb is 3.25 GPa along the most plausible(100)<010>slip system.This strength is higher than that of β-MgAgSb(0.80 GPa)and lower than that of γ-MgAgSb(3.43 GPa).The failure of α-MgAgSb arises from the stretching and breakage of MgeSb bond α-MgAgSb under pure shear load,while it arises from the softening of MgeAg bond and the breakage of AgeSb bond under biaxial shear load.This suggests that the deformation mechanism changes significantly under different loading conditions. | Guodong Li Qi An Umut Aydemir Sergey I.Morozov Bo Duan Pengcheng Zhai Qingjie Zhang William A.Goddard Ⅲ | 2020 | Journal of Materiomics2020，6，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员