A synthesis route was successfully established to reliably synthesize the high temperature thermoelectric material REB₆₆ (RE = Y, Sm, Ho, Tm, Yb) much more readily than the typical single crystal growth. Thermoelectric properties of HoB₆₆ and TmB₆₆ are also investigated for the first time. The REB₆₆ samples synthesized by spark plasma sintering showed thermoelectric properties equivalent to those measured on single crystals. A figure of merit ZT around 0.1 at 973 K was obtained with a sharply increasing trend toward higher temperatures. Strikingly, the thermoelectric properties of these compounds appear to be almost independent of the microstructure. The nature of the rare earth does not seem to strongly affect the thermoelectric properties, differences originating mainly from different compositions or the presence of secondary phases. Relatively large negative Curie-Weiss temperatures θ were observed, and an increasing coupling indicated from HoB₆₆ to YbB₆₆. This could be indicative of an unusual coupling mechanism.

成功建立了一条合成路线，以比典型的单晶生长更容易地可靠地合成高温热电材料REB ₆₆（RE = Y，Sm，Ho，Tm，Yb）。还首次研究了HoB ₆₆和TmB _66的热电性能。通过火花等离子体烧结合成的REB ₆₆样品显示出的热电特性与在单晶上测得的等效。品质因数ZT在973 K处获得了约0.1的值，并且温度趋于急剧升高。令人惊讶的是，这些化合物的热电性质似乎几乎与微观结构无关。稀土的性质似乎并没有强烈地影响热电性能，差异主要来自不同的组成或存在第二相。观察到相对较大的负居里-魏斯温度θ，并且表明从HoB ₆₆到YbB _66的耦合增加。这可能表示异常的耦合机制。