Electrical conductivity and structure of glasses in the Na2O-Na2S-P2O5 and Na2S-P2S5 systems

• Published in: Glass physics and chemistry 2011-06, Vol.37 (3), p.263-282
• Main Authors: Startsev, Yu. K., Pronkin, A. A., Sokolov, I. A., Murin, I. V.
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Glass; Materials Science; Natural Materials; Physical Chemistry
• ISSN: 1087-6596; 1608-313X
• DOI: 10.1134/S1087659611030138

The glasses, in which oxygen was partially replaced with sulfur, have been synthesized in the Na 2 O-P 2 O 5 -Na 2 S system. The chemical and chromatographic analyses of the glasses synthesized have been performed. The temperature-concentration dependences of electrical conductivity of the glasses have been studied over a wide temperature range; the glass transition temperatures and the nature of charge carriers have been determined. The IR spectra and Raman spectra have been recorded at room temperature; the density and microhardness of the glasses and ultrasound velocity have been measured. A comparison of the electrical conductivities of the investigated glasses with those of the earlier studied glasses in the Na 2 O-P 2 O 5 system has shown their fair coincidence. The introduction of sodium sulfide into the Na 2 O-P 2 O 5 system is accompanied by an approximately threefold increase in electrical conductivity, although the concentrations of charge carriers (sodium ions) in the glasses amount to ∼17 and ∼26 mmol/cm 3 , respectively. The rise in electrical conductivity has been assumed to be caused by the increase in the degree of dissociation of polar structural chemical units including sulfide ions and by the higher mobility of sodium ions in the oxygen-free matrix.