Premium
Characteristics of PbO–BiO 1.5 –GaO 1.5 Glasses Melted in SnO 2 Crucibles
Author(s) -
Cerri José A.,
Santos Iêda M. G.,
Longo Elson,
Leite Edson R.,
Lebullenger Ronan M.,
Hernandes Antonio Carlos,
Varela José A.
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02393.x
Subject(s) - crucible (geodemography) , materials science , platinum , infrared , absorption (acoustics) , mineralogy , thermal stability , analytical chemistry (journal) , metallurgy , chemistry , composite material , optics , biochemistry , physics , computational chemistry , organic chemistry , chromatography , catalysis
PbO‐BiO 1.5 ‐GaO 1.5 ‐based glasses are good candidates for optical applications, because of some of their interesting characteristics, such as high refraction indices and high transmission in the ultraviolet (UV), visible (VIS), and infrared (IR) regions. A limited stage in the processing of these glasses is the corrosion that is caused by the melt in all currently used conventional crucibles, such as noble metals (platinum or gold) and Al 2 O 3 . The absorption of crucible material by the glass composition may reduce the transmission level, the cutoff in the UV‐VIS, and IR regions, and the thermal stability. In this study, a SnO 2 crucible has been tested for PbO‐BiO 1.5 ‐GaO 1.5 molten glass. Optical and thermal analyses show, in some cases, advantages over the use of platinum and Al 2 O 3 crucibles. A visible cutoff value of 474 nm has been measured, and a longer melting time (850°C for 4 h) results in a significant reduction of the O‐H absorption band at 3.2 μm.