Effect of phosphorus oxide additives on the color and production conditions of Bi2O3 – SiO2 – P2O5 glass

Abstract

Transparent glass has been obtained in the system Bi 2 O 3 -SiO 2 -P 2 O 5 with molar content 57.1% Bi 2 O 3 , 42.9 -17.1% SiO 2 , and 0 -25.7% P 2 O 5 . It is found that the P 2 O 5 content affects the glassmaking temperature and the glass color. Such glasses are promising for use in photonics and as scintillation materials.

High‐temperature mass spectrometric study of the vaporization processes and thermodynamic properties of samples in the Bi2O3‐P2O5‐SiO2 system

“…The Al 2 O 3 content in two samples (NN 16 and 17) was higher than 14 mol.%; therefore, the thermodynamic properties of these samples obtained by high-temperature mass spectrometry were not taken into further consideration. The glass-forming regions determined in previous studies [1,2] and in the present investigation are in satisfactory agreement, as can be seen from Fig. 2.…”

“…Twenty-five samples among which seven samples belonged to the Bi 2 O 3 -P 2 O 5 system were synthesized for this purpose. The reasons for the choice of the concentration range were as follows: (i) the glass-forming regions in the system under study identified previously [1,2] and (ii) the validity range of Knudsen effusion mass spectrometry for studying vaporization processes and thermodynamic properties. NH 4 H 2 PO 4 , Bi 2 O 3 and SiO 2 with the purity 'pro analysi' were used for the synthesis of the samples in the Bi 2 O 3 -P 2 O 5 -SiO 2 system.…”

“…The relative error of the temperature determination was found to be 0.1-0.2%. The installation was calibrated using the vapor pressure of -, [2] - [7] , □ -the present study.…”

“…The glass-forming Bi 2 O 3 -P 2 O 5 -SiO 2 system is of importance in materials science and engineering due to its specific physicochemical properties such as low melting temperature, high adhesion to metals, [1] and low viscosity of the melts. [2] Not only can this system be used to obtain new materials such as optical fibers and lasers, [3] scintillators and radiationshielding glasses, [4] but it also holds promise for substitution of systems based on toxic lead silicate in glasses, enamels and ceramics. [5] Since the synthesis and application of materials based on the Bi 2 O 3 -P 2 O 5 -SiO 2 system often take place at high temperatures, it is necessary to have information concerning the vaporization processes and thermodynamic properties of the system mentioned.…”

“…[1] The influence of the replacement of SiO 2 by P 2 O 5 on the viscosity of glass-forming melts and the color of glasses in the Bi 2 O 3 -P 2 O 5 -SiO 2 system has also been investigated. [2] Based on measurement of optical absorption spectra it was found that in Bi 2 O 3 -SiO 2 glasses the bismuth ions are in the oxidation state +3 and the quantity of Bi +5 ions is negligibly small. [6] Information on the phase equilibria in the Bi 2 O 3 -P 2 O 5 -SiO 2 system was not found in any publication.…”