Abstract
Molybdenum ditelluride (MoTe2) is known to have two different crystal phases: α-MoTe2 and β-MoTe2. α-MoTe2 is the polytype stable below 815 °C, and β-MoTe2 is stable above 900 °C. Here, we report changes in the structure and composition of each single crystal during heating in low and high vacuum conditions. Contrary to the results of a recently published paper, we did not observe α-MoTe2 transforming to β-MoTe2 at elevated temperatures. In a low vacuum, the α-MoTe2 sample was mainly oxidized, forming MoO2. In a high vacuum, it partially decomposed with surface oxidation. The recently reported “reversible phase transition” of α-MoTe2 is the misinterpretation of X-ray diffraction data.
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