材料科学
功勋
凝聚态物理
热电效应
热稳定性
声子散射
离子
纳米复合材料
散射
载流子
晶界
声子
导线
纳米技术
微观结构
化学
复合材料
物理
热力学
光学
光电子学
有机化学
作者
Anil Bohra,Ranu Bhatt,Ajay Singh,Shovit Bhattacharya,Ranita Basu,Pramod Bhatt,M. Navaneethan,Shaibal K. Sarkar,Shahid Anwar,K. P. Muthe,D. K. Aswal
标识
DOI:10.1002/pssr.202000102
摘要
Cu 2 Se exhibits a high figure‐of‐merit ( ZT ) >1 due to the scattering of phonons by mobile Cu + ions, but migration of the Cu + ions leads to chemical instability at high temperature. It is demonstrated that the incorporation of W in the Cu 2 Se matrix results in peak ZT of 2.1 ( ZT avg = 0.93) at 878 K. After the first thermal cycle, the peak ZT of the composite decreases to stable value of ≈1.5 ( ZT avg = 0.97). The enhanced stability of the nanocomposite along with high ZT avg is attributed to the covering of Cu 2 Se grain boundaries with W that inhibits Cu + migration, reduces Se loss, and improves charge carrier mobility.
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