| 摘要 |
A thermoelectric material includes a multiple transition metal-doped type I clathrate crystal structure having the formula A8TMy11TMy22 . . . TMynnMzX46-y1-y2- . . . -yn-z. In the formula, A is selected from the group consisting of barium, strontium, and europium; X is selected from the group consisting of silicon, germanium, and tin; M is selected from the group consisting of aluminum, gallium, and indium; TM1, TM2, and TMn are independently selected from the group consisting of 3d, 4d, and 5d transition metals; and y1, y2, yn and Z are actual compositions of TM1, TM2, TMn, and M, respectively. The actual compositions are based upon nominal compositions derived from the following equation: z=8·qA−|&Dgr;q1|y1−|&Dgr;q2|y2− . . . −|&Dgr;qn|yn, wherein qA is a charge state of A, and wherein &Dgr;q1, &Dgr;q2, &Dgr;qn are, respectively, the nominal charge state of the first, second, and n-th TM.
|
