Electrical Conductivity of Na2O–B2O3–SiO2–Cr2O3 Glass System

• Published in: Glass physics and chemistry 2024-04, Vol.50 (2), p.207-210
• Main Authors: Lavrova, M. K., Konon, M. Yu, Semenova, E. A., Danilovich, D. P., Saratovskii, A. S.
• Format: Article
• Language: English
• Subjects: Boron oxides; Borosilicate glass; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chromium oxides; Composites; Composition; Electrical properties; Electrical resistance; Electrical resistivity; Glass; Heat treatment; Ion currents; Iron; Materials Science; Natural Materials; Physical Chemistry; Short Communications; Silicon dioxide; Specific volume; X ray powder diffraction
• ISSN: 1087-6596; 1608-313X
• DOI: 10.1134/S1087659624600339

The electrical properties of glasses composed of 8Na 2 O–(22 – x )B 2 O 3 –70SiO 2 – x Cr 2 O 3 , where x varies from 0.3 to 6 mol %, heat-treated at 550°C for 48 h, are studied. The structure of the glasses is studied using scanning electron microscopy and X-ray powder diffraction (XRPD). It is established that in all glasses of the selected compositions, during heat treatment, an interconnected phase-separated structure is formed and the eskolaite phase (α-Cr 2 O 3 ) also crystallizes. When comparing the obtained values of electrical resistance and activation energy of electrical conductivity of chromium-containing glasses and glass without Cr 2 O 3 composed of 8Na 2 O⋅22B 2 O 3 ⋅70SiO 2 and iron-containing glasses of similar compositions, it is suggested that the studied glasses with Cr 2 O 3 possess ionic conductivity and the values of the specific volume resistance of chromium-containing and iron-containing glasses do not differ from each other. The introduction of Cr 2 O 3 in sodium borosilicate glasses does not affect their electrical conductivity.