Thermoelectric properties of TaVO ₅ and GdTaO ₄ : An experimental verification of machine learning prediction

Advancements in materials discovery tend to rely disproportionately on happenstance and luck rather than employing a systematic approach. Recently, advances in computational power have allowed researchers to build computer models to predict the material properties of any chemical formula. From energy minimization techniques to machine learning-based models, these algorithms have unique strengths and weaknesses. However, a computational model is only as good as its accuracy when compared to real-world measurements. In this work, we take two recommendations from a thermoelectric machine learning model, TaVO ₅ and GdTaO ₄ , and measure their thermoelectric properties of Seebeck coefficient, thermal conductivity, and electrical conductivity. We see that the predictions are mixed; thermal conductivities are correctly predicted, while electrical conductivities and Seebeck coefficients are not. Furthermore, we explore TaVO ₅ ’s unusually low thermal conductivity of 1.2 Wm ⁻¹ K ⁻¹ , and we discover a possible new avenue of research of a low thermal conductivity oxide family.