Affiliation:
1. Department of Applied Physics, Graduate School of Engineering, Tohoku University , Sendai, Miyagi 980-8579, Japan
Abstract
Nowotny chimney ladder (NCL) phases are intermetallic binary compounds that typically crystallize in a tetragonal crystal structure and constitute of two separate subsystems. The rich solid-state chemistry of NCL phases inherits fascinating lattice dynamics with unique abilities for structural modifications. As an extensively studied energy material for the thermoelectric application, we overview the emerging aspects for structural interpretation in higher manganese silicides (MnSiγ), a prominently explored example of NCL phase. The progress in understanding the incommensurate composite crystals of MnSiγ is discussed to highlight its functional crystallography for proposing the effective strategies to attain favorable modification of transport properties of charge carriers (concentration, mobility, effective mass), and phonons (lattice thermal conductivity). The application potential and prospective strategies for enabling the rational optimization of the dimensionless thermoelectric figure of merit (zT) are examined, and the possibilities of chemical modification in MnSiγ and related NCL phases are presented.
Funder
Japan Society for the Promotion of Science
Japan Society for the Promotion of Science London
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
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