Work

Crystallographic Anisotropy Control of n-type Bi-Te-Se Thermoelectric Materials via Bulk Mechanical Alloying and Shear Extrusion

Year: 2004

Type: article

Abstract: The shear extrusion processing combined with bulk mechanical alloying is proposed to yield the n-type Bi-Te-Se material from elemental granules. It has well-developed texture so as to improve the electric conductivity and thermoelectric properties. The shear extrusion processing of (Bi2Se3)0.05(Bi2Te3)0.95 alloy green compact can afford the preferred orientation factor of anisotropic crystallographic structure: F = 0.67. The electric resistivity of (Bi2Se3)0.05(Bi2Te3)0.95 is controlled to be 0.491 × 10−5 (Ωm), which is 0.2 times lower than that of hot-pressed specimen. Maximum power factor is achieved to be 3.31 × 10−3 (W/mK2) even without any dopants. The bending strength of the material produced in this work is also improved to be 166 MPa, 1.7 times higher than that of conventional hot-extruded specimens.

Source: MATERIALS TRANSACTIONS

DOI: 10.2320/matertrans.45.918

Authors: Sang Seok Kim, Tatsuhiko Aizawa

Institutions: Research Center for Advanced Science and Technology, The University of Tokyo, The University of Tokyo

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: bronze

Funders: Ministry of Education, Culture, Sports, Science and Technology, Japan Society for the Promotion of Science