"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

MICROHETEROGENEOUS STRUCTURE OF MELTED AND GEL GLASSES IN THE SYSTEM PbO-B2O3

E. Kashchieva1, V. Ivanova1, B. Tasseva1, Y. Ivanova2, Y. Dimitriev2,*

Affiliation

  1. Department of Physics, University of Chemical Technology and Metallurgy, 8 “Kl. Ohridski” Blvd., 1756 Sofia, Bulgaria
  2. Department of Silicate Technology, University of Chemical Technology and Metallurgy, 8 “Kl. Ohridski” Blvd., 1756 Sofia, Bulgaria

Abstract

Glasses in the system PbO-B2O3 were synthesized by conventional melting technology and by a sol-gel method. The sample compositions were chosen in a large compositional range (from 7 to 35 mol. % PbO) according to the phase diagram of the system in which regions of macro- and micro-phase liquid-liquid phase separation are presented. The evolution of the micro-heterogeneous structure and phase formation after heat treatment of both types of glasses was studied using TEM in combination with XRD and IR spectroscopy. In the melted glasses, a large variety of micro-formations due to immiscibility and crystallization processes were observed, while the gel glasses possessed a more homogeneous structure containing only some droplet-like immiscibility heterogeneities. These glasses presenting an attractive medium for the creation of regularly distributed nano- and micro-sized immiscibility formations. They can be used for isolation of functional substances, and thus for obtaining different new nanocomposite materials..

Keywords

Lead-borate glass, Melted glass, Gel glass, Microstructure.

Submitted at: Dec. 9, 2004
Accepted at: Jan. 26, 2005

Citation

E. Kashchieva, V. Ivanova, B. Tasseva, Y. Ivanova, Y. Dimitriev, MICROHETEROGENEOUS STRUCTURE OF MELTED AND GEL GLASSES IN THE SYSTEM PbO-B2O3, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 397-400 (2005)