Half-Heusler alloys, a non-centrosymmetric structure variant of the Heusler type, create a category of advanced thermoelectric materials. The thermal and phase stability of half-Heusler alloys TiFe_1.33Sb and Ti_xNb_1-xFeSb (x = 0, 0.15), prepared by various techniques (hot pressing, ball milling or high-energy ball milling and hot pressing, as well as in one case with additional annealing), have been studied by means of differential thermal analysis and the Knudsen effusion method. The results from the measurement of phase transformations and evaporation of antimony, as the volatile element, supported by microstructure measurements and by diffusion profiles are presented and discussed in view of the long-term operation stability of the thermoelectric materials investigated. The alloys TiFe_1.33Sb and Ti_xNb_1-xFeSb have all evidenced only a slight evaporation of antimony and have proven their long-term stability at temperatures well above the operation temperature of ~873 K.

半赫斯勒合金是赫斯勒类型的非中心对称结构变体，创造了一类先进的热电材料。半赫斯勒合金 TiFe _1.33 Sb 和 Ti _x Nb _1-x的热稳定性和相稳定性通过不同的技术（热压、球磨或高能球磨和热压，以及在一种情况下进行额外退火）制备的 FeSb (x = 0, 0.15)，已经通过差热分析和克努森积液法。鉴于所研究的热电材料的长期运行稳定性，提出并讨论了由微观结构测量和扩散曲线支持的作为挥发性元素的锑的相变和蒸发测量结果。合金 TiFe _1.33 Sb 和 Ti _x Nb _1-x FeSb 都仅显示出轻微的锑蒸发，并证明了它们在远高于 ~873 K 的操作温度的温度下的长期稳定性。