| 摘要 |
A Ba0- and PbO-free X-ray opaque glass is disclosed which has a refractive index ndof 1.480 to 1.517 and a high X-ray opacity with an aluminium equivalent thickness of at least 180%. The glass is based on the system Si02- B203- Cs20 - K20 -La203with additions of Al203, Li20, Na20 and/or Zr02. The composition is (in wt %)SiO263-70B2O312-16K2O 2-7Cs2O 6-13La2O3>2-7Al2O30-4Li2O 0-1Na2O 0-3ZrO20-4&Sgr; alkali metal oxides 11-18Cs2O + La2O3> 8 The glass can be used, in particular, as dental glass or as optical glass. |
