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We report on the growth of Y2Ti2O7 single crystals by optical floating zonetechnique. X-ray diffraction and Raman spectroscopy studies confirm thestructural quality of the crystal. The UV-Vis optical studies reveal that thegrown crystals have a high optical transparency with an optical band gap of3.44 eV. The hardness of Y2Ti2O7 single crystal is measured for the first timeusing nanoindentation. The measured hardness, indentation and bulk modulus arefound to be 16.4$\pm$0.4, 321.1$\pm$6.9 and 243.3$\pm$5.2 GPa respectively,which are higher than its polycrystalline counterpart and its constituent metaloxides, Y2O3 and TiO2.

Structural, optical and mechanical properties of Y2Ti2O7 single crystal