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- Title
Thermoelectric Transport in p-Type (Pb0.98Na0.02Te)1−x(Zn0.85Al0.15Te)x-Te Composites Fabricated Using a Combination of Hydrothermal Synthesis and Evacuating-and-Encapsulating Sintering.
- Authors
Yang, Zong-Ren; Liu, Chia-Jyi
- Abstract
Two precursors, viz. Pb0.98Na0.02Te and Zn0.85Al0.15Te, have been synthesized using low-temperature hydrothermal synthesis, followed by thorough mixing and grinding to obtain (Pb0.98Na0.02Te)1−x(Zn0.85Al0.15Te)x-Te composites with x = 0.04, 0.08, 0.12, and 0.20. The resulting powders were sintered at 380°C for 24 h in an evacuated and encapsulated ampoule. Electrical and thermal properties of the resulting composites were measured as a function of temperature between 90 K and 300 K. Interestingly, both the electrical conductivity and thermopower increased with increasing x. Considering that the resistivity of Zn0.85Al0.15Te is higher than that of Pb0.98Na0.02Te, these experimental results might be associated with short-range percolation or band bending after compositing. The total thermal conductivity at room temperature for the composites with x = 0.04, 0.08, and 0.12 was lower than 1.5 W/m-K, significantly below the range of 2 W/m-K to 3.2 W/m-K for PbTe. The composite with x = 0.08 exhibited the highest zT value of about 0.07 at 300 K.
- Subjects
THERMAL conductivity; THERMAL properties; SINTERING; ELECTRIC conductivity; HYDROTHERMAL synthesis; THERMOELECTRIC power; THERMOELECTRIC materials; METALS at low temperatures
- Publication
Journal of Electronic Materials, 2020, Vol 49, Issue 5, p2954
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-020-07994-2