Thermoelectric properties of n-type (Bi2Se3)x(Bi2Te3)1−x prepared by bulk mechanical alloying and hot pressing

Thermoelectric Property Studies on Cu‐Doped n‐type CuxBi2Te2.7Se0.3 Nanocomposites

“…For this reason, their polycrystalline counterparts are also used in commercial devices, despite their worse thermoelectric performance. [4][5][6] Recently, ZT values of 1.3 using elemental chunks [ 7 ] and 1.4 using crystalline ingots [ 8 ] as the feedstocks were achieved in nanostructured p-type Bi 2−x Sb x Te 3 nanocomposites by combining high-energy ball milling (BM) and direct current hot-pressing (dc-HP). These values correspond to a 30 ∼ 40% improvement in the peak ZT values compared with their single-crystal counterpart.…”

Solid-State Synthesis of Thermoelectric Materials in Mg–Si–Ge System

“…This process was successfully used to yield various magnesium base alloys and compounds: e.g., solid-state synthesis of Mg 2 Si 12,13) and non-equilibration of Mg 2 Ni and Mg 2 Co. [14][15][16] In addition, BMA with hot pressing (HP) or hot extrusion has become a new processing to make anisotropic control of crystalline structure for improvement of thermoelectric properties in Bi-Te systems. [17][18][19][20] Although the synthesis of Mg 2 Si 1Àx Ge x was made by the melting and solidification method, 10,11) no reports were found for its solidstate synthesis at room temperature. In the present approach, magnesium is free from vaporizing and Si or Ge are also impossible to react with other constituents than Mg at room temperature.…”

Effect of solvent on the microstructures of nanostructured Bi2Te3 prepared by solvothermal synthesis

“…The figure of merit, ZT = (α 2 σ/κ)T , of the best Bi 2 Te 3 based alloys is about unit [3], where α is the Seebeck coefficient, σ and κ the electric and thermal conductivity, respectively. Many works have been done in recent years to improve the thermoelectric properties of Bi 2 Te 3 based alloys [4][5][6]. It was reported that the figure of merit of thermoelectric materials could be significantly improved if the materials were nanostructured [7], such as quantum dot superlattices [8,9] and nanowires [10,11].…”