Pressure Effect of Seebeck Coefficient for Zinc Doped Tin Clathrates
نویسندگان
چکیده
We measured the temperature dependence of electrical resistance (R) and thermopower (S) of Cs8Zn4Sn42 under high pressure up to 1.2 GPa. Both R and |S| at room temperature increased with pressure. We observed gap widening, irreversible |S| increasing under high pressure, which were similar to the behaviors of Cs8Sn44. However, the relaxation effect of R for Cs8Zn4Sn42 was negligible in contrast with that of Cs8Sn44. We found that the power factor Sσ (σ: electrical conductivity) near room temperature decreased linearly with pressure. The results suggest that the defects in different forms played an important role in transport properties for tin clathrates under high pressure.
منابع مشابه
Enhanced Seebeck coefficient through energy-barrier scattering in PbTe nanocomposites
Resistivity, Seebeck coefficient, and Hall measurements were performed on densified nanocrystalline composite materials of undoped and Ag-doped PbTe nanocrystals to investigate the physical mechanisms responsible for Seebeck coefficient enhancement in nanocrystalline systems. The unique temperature dependence of the resistivity and mobility for these PbTe nanocomposites suggests that grain-boun...
متن کاملSynthesis, structure, magnetism, and high temperature thermoelectric properties of Ge doped Yb14MnSb11.
The Zintl phase Yb(14)MnSb(11) was successfully doped with Ge utilizing a tin flux technique. The stoichiometry was determined by microprobe analysis to be Yb(13.99(14))Mn(1.05(5))Sb(10.89(16))Ge(0.06(3)). This was the maximum amount of Ge that could be incorporated into the structure via flux synthesis regardless of the amount included in the reaction. Single crystal X-ray diffraction could no...
متن کاملThermoelectric Properties of Bi2Te3: CuI and the Effect of Its Doping with Pb Atoms
In order to understand the effect of Pb-CuI co-doping on the thermoelectric performance of Bi₂Te₃, n-type Bi₂Te₃ co-doped with x at % CuI and 1/2x at % Pb (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.10) were prepared via high temperature solid state reaction and consolidated using spark plasma sintering. Electron and thermal transport properties, i.e., electrical conductivity, carrier concentration, ...
متن کاملEffect of gallium doping and ball milling process on the thermoelectric performance of n-type ZnO
We report a systematic investigation of the thermoelectric properties of n-type Ga-doped ZnO synthesized using different ball milling conditions. Samples fabricated by the high-energy ball milling resulted in a highly dense layered structure with randomly distributed voids. These samples measured the lowest room temperature thermal conductivity, i.e., 27 W/mK due to increased phonon scattering....
متن کاملSynthesis and Characterization of Zn-doped and un-doped SnO2 nanostructures for PV Applications
Tin oxide nanostructures, un-doped and Zn-doped, have been prepared by conventional sol-gel technique. Research grade tin chloride (SnCl2.2H2O) and zinc acetate (Zn(O2C2H3)2) were used as tin and zinc sources. Ethylene glycol and alcohol were used as solvents under different synthesis conditions. Transparent un-doped and Zn-doped SnO2 sol was prepared after continuous stirring and refluxing at ...
متن کامل