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The effect of the crystal structure of the Mo sublayer on the resistance of the zirconium alloy Zr–1Nb with a Cr/Mo coating to high-temperature oxidation in air is studied. Three types of coatings are deposited by magnetron sputtering: single-layer Cr coating with a thickness of 8 µm and two-layer coatings with a sublayer of Mo (3 µm) of various textures and an outer protective layer of Cr (8 µm). Different textures of molybdenum films are formed by changing the configuration of the magnetron-sputtering system. Coated samples are oxidized in an atmospheric oven at 1100°C for 15, 30, 45, and 60 min. The results of X-ray-diffraction- and scanning-electron microscopy show that the use of a Mo sublayer limits the mutual diffusion of the Cr–Zr system. The diffusion of Mo leads to the formation of interdiffusion layers of Cr–Mo and Mo–Zr. Faster diffusion is observed at the Cr–Mo interface. The thickness of the residual Cr layer in two-layer coatings is greater than that in a single-layer coating under similar oxidation conditions

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