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Enhanced Thermoelectric Performance of Nanostructured Nickel Doped Ag2Te by Sharma, Vikash; Sharma, Divya; Bhatt, Ranu; Patro, Pankaj; Okram, Gunadhor Singh is a scholarly article available to read on EtoBox.

What is Enhanced Thermoelectric Performance of Nanostructured Nickel Doped Ag2Te about?

We report on the thermoelectric properties of nickel doped Ag2-xNixTe (x = 0, 0.015, 0.025 & 0.055, 0.115, 0.155) nanostructures in the temperature (T) range of 5 K to 575 K. The electrical resistivity of Ag2Te nanostructure shows metallic behaviour in 5 K to 300 K initially that evolves into two metal to insulator transitions (MITs) at low and mid-temperature regimes with increasing x due to Mott-variable range hopping (VRH) and Arrhenius transports, respectively. Their Seebeck coefficient varies nearly in a linear fashion in this temperature range, showing metallic or doped-degenerate semiconducting behaviour. Notably, this behaviour of the Seebeck coefficient is in contrast to Mott VRH conduction as observed in resistivity. The steady increase in resistivity and S with the sharp decrease in thermal conductivity between 410 K to 425 K associated with the structural phase transition accomplishes a maximum thermoelectric figure of merit (ZT) of 0.86 near 480 K in x = 0.155. This is about 83 % more compared to that of bulk Ag2Te, and shows a significant improvement over the best value reported for Ag2Te nanostructures thus far. This study, therefore, shows that simultaneous nanocomp

Author

Sharma, Vikash; Sharma, Divya; Bhatt, Ranu; Patro, Pankaj; Okram, Gunadhor Singh

Published

2022

Language

EN