Thermoelectric conversion material and thermoelectric conversion module

A thermoelectric conversion module comprising:

• a thermoelectric conversion material;
• an electrode;
• and
• a joining member provided between the thermoelectric conversion material and the electrode,
• wherein the thermoelectric conversion material has a structure expressed by the formula:
• Ga0.1Rr-0.1Tt-mMmXx-nNn (0.1<r≤1, 3≤t−m≤5, 0≤m≤0.5, 10≤x≤15, 0≤n≤2),
• where R represents two or more elements belonging to at least two different groups selected from the groups consisting of a rare earth element group, an alkaline-earth metal element group, and a group 4 element group, and the rare earth element group consists of La, Ce, Pr, and Yb, the alkaline-earth metal element group consists of Ca and Ba, and the group 4 element group consists of Ti,
• R optionally contains a group 13 element consisting of Al and In,
• T represents at least one element selected from Fe and Co,
• M represents at least one element selected from the group consisting of Ru, Os, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au,
• X represents Sb, and
• N represents at least one element selected from Se and Te,
• wherein either m or n in Ga0.1Rr-0.1Tt-mMmXx-nNn is larger than 0, and
• wherein
• said joining member is a joining layer including an alloy layer made of at least one alloy selected from the group consisting of a titanium alloy that contains 50 wt % or more and less than 100 wt % of Ti, and more than 0 wt % and 50 wt % or less of at least one element of Al, Ga, In and Sn;
• a cobalt alloy that contains 50 wt % or more and less than 100 wt % of Co, and more than 0 wt % and 50 wt % or less of Ti;
• and an iron alloy that contains 50 wt % or more and less than 100 wt % of Fe, and more than 0 wt % and 50 wt % or less of Ti.