High thermoelectric power factor in Cu–Ni alloy originate from potential barrier scattering of twin boundaries》.pdf

Nano Energy (2015) 17, 279–289 Available online at journal homepage: /locate/nanoenergy COMMUNICATION High thermoelectric power factor in Cu–Ni alloy originate from potential barrier scattering of twin boundaries a,b,1 a,c,1 a a,d Jun Mao , Yumei Wang , Hee Seok Kim , Zihang Liu , a a a a Udara Saparamadu , Fei Tian , Keshab Dahal , Jingying Sun , Shuo Chena, Weishu Liua,n, Zhifeng Rena,n aDepartment of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA bDepartment of Mechanical Engineering, University of Houston, Houston, TX 77204, USA cBeijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China dNational Key Laboratory for Precision Hot Processing of Metals and School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China Received 17 July 2015; received in revised form 31 August 2015; accepted 3 September 2015 Available online 12 September 2015 KEYWORDS Abstract Thermoelectric; Constantan alloy (Cu–Ni) has been known for a long time in thermocouples due to its thermal Cu–Ni alloy; power property. In this study, we show an enhancement in thermoelectric performance of Nanoscale twins; Cu56Ni42Mn2 alloy by introducing nanoscale twins into its microstructure. Comparing to arc- Potential barrier melted ingot (without nanoscale twins), the ball milled and hot pressed (BM–HP) samples wit