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Transition metal perovskite chalcogenides, a class of materials with richtunability in functionalities, are gaining increased attention as candidatematerials for renewable energy applications. Perovskite oxides are consideredexcellent n-type thermoelectric materials. Compared to oxide counterparts, weexpect the chalcogenides to possess more favorable thermoelectric propertiessuch as lower lattice thermal conductivity and smaller band gap, making thempromising material candidates for high temperature thermoelectrics. Thus, it isnecessary to study the thermal properties of these materials in detail,especially thermal stability, to evaluate their potential. In this work, wereport the synthesis and thermal stability study of five compounds,\alpha-SrZrS$_3$, \beta-SrZrS$_3$, BaZrS$_3$, Ba$_2$ZrS$_4$, andBa$_3$Zr$_2$S$_7$. These materials cover several structural types includingdistorted perovskite, needle-like, and Ruddlesden-Popper phases. Differentialscanning calorimeter and thermo-gravimetric analysis measurements wereperformed up to 1200{\deg}C in air. Structural and chemical characterizationssuch as X-ray diffraction, Raman spectroscopy, and energy dispersive analyticalX-ray spectroscopy were performed on all the samples before and after the heattreatment to understand the oxidation process. Our studies show that perovskitechalcogenides possess excellent thermal stability in air at least up to600{\deg}C.

Thermal Stability Study of Transition Metal Perovskite Sulfides