Thermal Conductivity Paper Database

Anisotropy measurements of a cuboid of nanostructured hydrothermally prepared Bi_0.45Sb_1.55Te₃

Thermoelectric materials can be used to convert waste heat, such as solar energy and automobile exhaust, to electricity. A Bi_0.45Sb_1.55Te₃ p-type cuboid was created using hydrothermal synthesis, cold pressing, and evacuated-and-encapsulated sintering in a Pyrex ampoule. The figure of merit (z) was determined by finding three transport parameters: electrical conductivity, thermopower, and thermal conductivity. The thermal conductivity measurements on the three (A, ...

Author(s): Ankam Bhaskar, Chia-Jyi Liu, Hsin -Chang Lai, Yen-Liang Liu

Thermoelectric properties of compacted Bi_2-xSb_xTe₃ nanoplatelets with nominal composition of x = 1.5

Hydrothermal methods were used to synthesize nanoplatelets of Bi_2-xSb_xTe₃. In this article, the electrical conductivity, thermopower, and thermal conductivity were the temperature-dependent transport parameters that were determined to calculate the dimensionless figure of merit, ZT. The thermal conductivity measurements were carried out using the transient plane source (TPS) technique with the thermal constants analyzer. The alloy had a low thermal ...

Author(s): Chia-Jyi Liu, Gao-Jhih Liu, Liang-Ru Chen, Yen-Liang Liu

Effects of Reaction Temperature on Thermoelectric Properties of p-Type Nanostructured Bi2−x Sb x Te3 Prepared Using Hydrothermal Method and Evacuated-and-Encapsulated Sintering

Bi2-xSbxTe3 thermoelectric materials, where x = 1.52 and 1.55 were prepared and evaluated for their thermoelectric properties. Three samples in total were prepared, two with x = 1.52 and 1.55 were synthesized at 140oC and one with x = 1.55 was synthesized at 160 oC. It was determined that the two samples synthesized at the higher temperature had lower resistivity than that which was synthesized at higher temperature. The figure of merit for the sample synthesized at 140oC, ...

Author(s): Chia-Jyi Liu, Hsin -Chang Lai, Liang-Ru Chen, Yen-Liang Liu, Yi-Yan Zou

High thermoelectric figure-of-merit in p-type nanostructured (Bi,Sb)2 Te3 fabricated via hydrothermal synthesis and evacuated-and-encapsulated sintering

A series of Bi(2-x)Sb(x)Te3 powders were prepared via hydrothermal methods by varying x (x=1.45, 1.50, 1.55, 1.56). These powders were then heavily characterized by XRD, EDS, ICP-AES, TEM, SEM and the TPS technique. A low thermal conductivity was desired, so as to give the highest thermoelectric figure of merit (ZT). It was determined that the highest figure of merit was obtained when x=1.55, which resulted in a value of 1.65 ...

Author(s): Chia-Jyi Liu, Hsin -Chang Lai, Liang-Ru Chen, Yen-Liang Liu

Enhanced thermoelectric performance of compacted Bi0.5Sb1.5Te3 nanoplatelets with low thermal conductivity

A series of compacted Bi0.5Sb1.5Te3 nanoplatelets are synthesized using hydrothermal methods, followed by cold pressing and sintering at temperatures between 300°C and 380°C. A variety of thermal, mechanical and electrical analyses are then performed on the synthesized nanoplatelets including: TPS technique for thermal conductivity, SEM/TEM/AFM to elucidate the mechanical and physical properties of the nanoplatelets, and the Oxford closed cycle cooler cryostat for measurement of electrical ...

Author(s): Chia-Jyi Liu, Gao-Jhih Liu, Liang-Ru Chen, Yen-Liang Liu