Abstract: A method of manufacturing a thermoelectric conversion material includes a sintering step. In the sintering step, a sintered body of a sintered material (20) is obtained by applying a voltage to a conductive mold (10) in a first direction so as to cause energization under the condition in which an insulating layer (30) is disposed in at least a portion between an inner wall (12) of the mold (10) and the sintered material (20) and the insulating layer (30) keeps having insulating properties. Here, the sintered body is a thermoelectric conversion substance.

Abstract: A thermoelectric conversion material has a composition represented by General Formula LkRrTt?mMmSbx. Here, L includes at least one element selected from rare earth elements. R includes two or more elements selected from the group consisting of alkali metal elements, alkali earth metal elements, Group 4 elements, and Group 13 elements. T includes at least one element selected from Fe and Co. M includes at least one element selected from the group consisting of Ru, Os, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au. In addition, 0.50?k?1.00, 0.1?r?0.5, 3.0?t?m?5.0, 0?m?0.5, 10.0?x?11.5, and x/t<3.0 are satisfied.

Abstract: A method of manufacturing a thermoelectric conversion material includes a sintering step. In the sintering step, a sintered body of a sintered material (20) is obtained by applying a voltage to a conductive mold (10) in a first direction so as to cause energization under the condition in which an insulating layer (30) is disposed in at least a portion between an inner wall (12) of the mold (10) and the sintered material (20) and the insulating layer (30) keeps having insulating properties. Here, the sintered body is a thermoelectric conversion substance.

Abstract: A thermoelectric conversion material has a composition represented by General Formula LkRrTt-mMmSbx. Here, L includes at least one element selected from rare earth elements. R includes two or more elements selected from the group consisting of alkali metal elements, alkali earth metal elements, Group 4 elements, and Group 13 elements. T includes at least one element selected from Fe and Co. M includes at least one element selected from the group consisting of Ru, Os, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au. In addition, 0.50?k?1.00, 0.1?r?0.5, 3.0?t-m?5.0, 0?m?0.5, 10.0?x?11.5, and x/t<3.0 are satisfied.

Abstract: Provided is a thermoelectric conversion material including a plurality of kinds of phases including a first phase and a second phase which have elemental compositions different from each other. The first phase and the second phase have a skutterudite structure.

Abstract: A thermoelectric conversion material (10) according to an embodiment includes a plurality of parent-phase particles (22) and nanoparticles (30). The parent-phase particles (22) have a crystalline structure. Each of the nanoparticles (30) includes an oxide and exists at an interface between the parent-phase particles (22). The nanoparticles (30) include at least one element that constitutes the crystalline structure. When a range of 6 ?m×4 ?m of the thermoelectric conversion material (10) is observed with a scanning electron microscope to acquire one sheet of cross-sectional observation image, an average particle diameter d, which is an average of an equivalent circle diameter of a particle group including the parent-phase particles (22) and the nanoparticles (30) which are observed on the cross-sectional observation image, is equal to or more than 100 nm and equal to or less than 1000 nm.

Abstract: Provided is a thermoelectric conversion material including a plurality of kinds of phases including a first phase and a second phase which have elemental compositions different from each other. The first phase and the second phase have a skutterudite structure.