Besides the preliminary studies undertaken by Zhu et al., relatively little is known about the fundamental TE transport properties and doping characteristics of Y 2 Te 3 . The ordered vacancies in the Y 2 Te 3 structure likely promotes point defect scattering of phonons and lattice softening, both of which contribute to the lowering of κ L . The TE performance of Y 2 Te 3 was found to be comparable to La 3-x Te 4 and Yb 14 MnSb 11 , reaching a zT ∼ 0.8 at 900 K when doped/alloyed with Bi. In their study, Zhu et al. acknowledged the anomalous n-type doping with Bi 3+ , which is instead expected to isoelectronically substitute Y 3+ . As such, there are open questions about the transport properties and doping behavior of orthorhombic Y 2 Te 3 .