Structural, optical and mechanical properties of Y2Ti2O7 single crystal

TL;DR

This study reports the growth and comprehensive characterization of high-quality Y2Ti2O7 single crystals, revealing their structural, optical, and mechanical properties, including a high optical transparency and superior hardness compared to polycrystalline forms.

Contribution

First demonstration of Y2Ti2O7 single crystal growth via optical floating zone and detailed analysis of its structural, optical, and mechanical properties.

Findings

High optical transparency with a band gap of 3.44 eV.

Hardness of 16.4 GPa measured for the first time.

Mechanical properties surpass those of polycrystalline Y2O3 and TiO2.

Abstract

We report on the growth of Y2Ti2O7 single crystals by optical floating zone technique. X-ray diffraction and Raman spectroscopy studies confirm the structural quality of the crystal. The UV-Vis optical studies reveal that the grown crystals have a high optical transparency with an optical band gap of 3.44 eV. The hardness of Y2Ti2O7 single crystal is measured for the first time using nanoindentation. The measured hardness, indentation and bulk modulus are found 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 metal oxides, Y2O3 and TiO2.