Patent ID: 11958770
Assignee: SCHOTT AG
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 12:
13. A glass having a refractive index nd of at least 2.02 and an internal transmission TI of at least 85%, measured at a wavelength of 460 nm and a sample thickness of 10 mm, wherein the glass comprises the following components in % by weight:, Proportion 

Component
(% by weight)

SiO2 + B2O3
 6-16

La2O3
40-55

Gd2O3
 4-11

Nb2O5
 6-14

TiO2
  8-18.5

ZrO2
 5-11;

wherein a sum of the proportions of La2O3, Nb2O5, TiO2 and ZrO2 is at least 77% by weight and a weight ratio of a sum of the proportions of La2O3, Nb2O5 and ZrO2 to the proportion of TiO2 is at least 3.85:1, and wherein a weight ratio of the proportion of SiO2 to the proportion of B2O3 is at least 0.65:1.