Work

Study of Structural and Dimensional Characteristics of the Melt Spun p–Bi0.5Sb1.5Te3 Powders Compacted by Vacuum Hot Pressing and Spark Plasma Sintering

Year: 2015

Type: article

Abstract: P –type thermoelectric Bi 0,5 Sb 1,5 Te 3 powders were obtained by the melt spinning technique (extremely rapid quenching from the liquid state) and their structural and dimensional characteristics were characterized. The crystallographic group and the lattice parameters of the powders correspond to those for Bi 0,5 Sb 1,5 Te 3 crystallized in equilibrium conditions which suggests the identity of the crystal structure. The powders were compacted by vacuum hot pressing and spark plasma sintering. We found that the partial axial texture [001] directed along the axis of pressure application could be formed during the compacting of the powders. Temperature dependences of the thermoelectric characteristics of the compacted material were measured in a direction perpendicular to the pressure application axis in the 100—700 K range. It is demonstrated that the compacted samples possess low thermal conductivity while retaining the Seebeck coefficient and the electrical conductivity values comparable to crystallized material; therefore ZT reaches 1,05—1,15 in the 330—350 K range which indicates high prospects of applying these technologies.

Source: Izvestiya Vysshikh Uchebnykh Zavedenii Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering

DOI: 10.17073/1609-3577-2014-2-86-91

Authors: A. A. Melnikov, V. G. Kostishin, S. A. Kichik, V. V. Alenkov

Institution: National University of Science and Technology

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: hybrid

Funders: National Science Foundation, University of Wisconsin-Madison, Division of Materials Research