| 摘要 |
Doped and partially-reduced oxide (e.g., SrTiO3-based) thermoelectric materials. The thermoelectric materials can be single-doped or multi-doped (e.g., co-doped) and display a thermoelectric figure of merit (ZT) of 0.2 or higher at 1050 K. Methods of forming the thermoelectric materials involve combining and reacting suitable raw materials and heating them in a graphite environment to at least partially reduce the resulting oxide. Optionally, a reducing agent such as lanthanum boride, titanium carbide, titanium nitride, or titanium boride can be incorporated into the starting materials prior to the reducing step in graphite. The reaction product can be sintered to form a dense thermoelectric material. |
| 主权项 |
1. A doped, partially-reduced, calcium-containing thermoelectric oxide material represented by a formula:
(Sr1-xD1x)1-z(Ti1-yD2y)TizO3-m, where D1 and D2 each represent one or more dopant atoms selected from the group consisting of Ca, Ce, Nb, Ta, La, Y, and other rare earth or alkaline earth elements, wherein at least one of D1 and D2 comprises Ca; and wherein 0≦x≦0.4, 0≦y≦0.4, 0.025≦(x+y)≦0.4, 0≦z≦0.15, and m defines an oxygen non-stoichiometry with 0≦m≦0.1, and further comprising at least one second phase selected from the group consisting of LaB6, TiC, TiN, TiOx (x≦2) and TiB2. |
