Work

Improvement of Thermoelectric Properties of Chimney-Ladder Compounds by Introducing High-Density Interfaces

Year: 2012

Type: article

Abstract: Phase relationships of Mn-substituted Ru2Si3 with the chimney-ladder structure have been investigated by using scanning and transmission electron microscopy. A series of chimney-ladder phases Ru1-xMnxSiy are formed over a wide compositional range between Ru2Si3 and Mn4Si7. The c-axis dimension of the Si subcell increases with the Mn content accompanied with the increase in the Si/M ratio (y=Si/(Ru+Mn)). A large extent of compositional variation is observed in the directionally solidified chimney-ladder compounds. The interface between adjacent chimney-ladder phases with different Mn contents is considered to have no influence on the electrical properties but have some influence on the lattice thermal conductivity. The dimensionless figure-of-merit increases with the increase in the density of the interfaces.

Source: Journal of the Japan Society of Powder and Powder Metallurgy

DOI: 10.2497/jjspm.59.175

Authors: Norihiko L. Okamoto, Haruyuki Inui

Institution: Kyoto University

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: diamond

Funder: Japan Society for the Promotion of Science

Award: Development of Dual Phase Thermoelectric Materials with Local Phonon Mismatch