PHOSPHATE GLASS: PbO‐WO₃‐P₂O₅ SYSTEM*

Abstract

The glass-formation region has been determined for the PbO-W03-P205 system$ and certain physical properties of representative glasses have been measured. Glasses of the system show an unusually high X-ray and gamma-ray absorption and are not readily discolored when exposed to X rays. Equations have been developed from which specific volumes and lead equivalents may be calculated from composition. Because of their high index of refraction and relatively low dispersion these glasses are also useful for optical purposes.Works, Corning, N. Y . ; Westinghouse Research Laboratories, East Pittsburgh, Pa.; and the University of Pittsburgh, Pittsburgh, Pa. Patent applied for.ally transparent lead-containing glasses a "glassformer" must be added, and then only in a minimum amount be-1 Ernst Kordes, "Physicochemical Investigation of Fine Structure of Glasses: I, Molar Refraction of Binary Phosphate, Silicate, and Borate Glasses," Z . anorg. allgem. Chem., 241 [I] 1-38 (1939); Ceram. Abstracts, 18 [8] 207 (1939) (abstracted from Ghsfech. Ber., 17 [3] 65-76 (1939)). 153 6 W.

Preparation and optical properties of HoF3–BaF2–AlF3–GeO2 glasses

“…3 correspond to the data of the typical oxide and fluoride glasses [39], respectively. The oxide glasses include quartz glass [40], borosilicate glass (Iwaki Glass Co. COVER 18-18), PbO-WO 3 -P 2 O 5 -CdO-TiO 2 glass [41] and various oxide glasses in the literature found in the INTER-GLAD database [39] in this case. ZBLAN [24,25,[35][36][37][38] glass etc.…”

Local order around tungsten atoms in tungstate fluorophosphate glasses by X-ray absorption spectroscopy

“…Thus, amorphous WO 3 thin films were intensively investigated because of their significant advantages over other materials on reversibility, stability and color efficiency [2,3]. In the case of tungsten-based glasses, it was shown that the introduction of WO 3 can improve considerably the chemical durability and thermal stability against devitrification [4][5][6][7]. In addition, these glasses can exhibit particular optical properties such as upconversion phenomena when doped with Tm 3+ or two-photon nonlinear absorption for the most WO 3 concentrated samples [8,9].…”

New tungstate fluorophosphate glasses

“…This work intents to define a new group of fluorophosphate glasses, tungstate fluorophosphate glasses based on the ternary NaPO 3 -BaF 2 -WO 3 association. It was expected that tungsten oxide content would influence significantly thermal and optical properties [8][9][10]. Especially, large WO 3 concentrated vitreous samples would be very stable against devitrification [11][12][13][14][15] and would present special properties observed in crystalline WO 3 such as thermochromism, photochromism [16,17] or non-linear optical properties [18][19][20][21][22][23].…”