High‐refraction index glasses with ultra‐high Young's modulus and high hardness fabricated by containerless processing

Abstract High‐refractive index glasses with ultra‐high Young's modulus and superior hardness have significant application in optical lenses. Research indicates that high‐entropy glasses, enriched with high dissociation energy and high‐field strength components, enhance the mechanical properties of glass. In this study, we tailored high‐entropy glasses to achieve superior optical and mechanical attributes by optimizing heavy metal oxide components and adjusting the Al 2 O 3 content. The resultant 10RE 2 O 3 ‐10Gd 2 O 3 ‐32Al 2 O 3 ‐36Ta 2 O 5 ‐12ZrO 2 (RE = La, Tm, Lu) glass demonstrates a refractive index of 2.028, a Young's modulus of 186.2 GPa, and a Vickers hardness of 9.18 GPa. The glass was colorless and widely transparent, in the visible‐to‐infrared region from 312.5 to 6674 nm, and the maximum transmittance reach up to 79.3%. These results indicate that the 10RE 2 O 3 ‐10Gd 2 O 3 ‐32Al 2 O 3 ‐36Ta 2 O 5 ‐12ZrO 2 glass would be useful for camera and detector lenses.