Improvement of environment-friendly thermoelectric materials based on lattice defects control of ordered structures

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Thermoelectric power generation system, that enables to generate electrical power by the temperature difference based on unused thermal power resources, can contribute greatly to the reduction of greenhouse gas emission and to the promotion of energy conservation. The objective of the present work is to fabricate thermoelectric materials that have high potential for the practical use, excellent cost performance and environment-friendly compositions. Interests of this work were focused on half-Heusler compounds to propose new and original approaches for improving thermoelectric properties by positively controlling several types of lattice defects, defects in ordered atomic arrangements (ordered structure). Consequently, the enhancement of thermoelectric performance of half-Heusler compound alloys was successfully achieved by controlling a good balance of electrical properties and thermal properties.