MATÉRIAU DE CONVERSION THERMOÉLECTRIQUE DE MAGNÉSIUM, ÉLÉMENT DE CONVERSION THERMOÉLECTRIQUE DE MAGNÉSIUM, ET PROCÉDÉ DE PRODUCTION DE MATÉRIAU DE CONVERSION THERMOÉLECTRIQUE DE MAGNÉSIUM

摘要

A magnesium-based thermoelectric conversion material (11) made of a sintered compact of a magnesium compound, in which, in a cross section of the sintered compact, a Si-rich metallic phase (15) having a higher Si concentration than in magnesium compound grains is unevenly distributed in a crystal grain boundary between the magnesium compound grains, an area ratio of the Si-rich metallic phase (15) is in a range of 2.5% or more and 10% or less, and a number density of the Si-rich metallic phase (15) having an area of 1 µm