Electrical Conductivity and Structure of Glasses
in the Na₂ONa₂SP₂O₅ and Na₂SP₂S₅ Systems

Yu. K. Startsev^a, *, A. A. Pronkin^a, I. A. Sokolov^b, and I. V. Murin^c

^aSt. Petersburg State Institute of Technology (Technical University), Moskovskii pr. 26, St. Petersburg, 190013 Russia

*e-mail: start_yurii@list.ru

^bSt. Petersburg State Polytechnical University, Politekhnicheskaya ul. 29, St. Petersburg, 195251 Russia

^cSt. Petersburg State University, Universitetskii pr. 2, Petrodvorets, St. Petersburg, 198504 Russia

Received November 24, 2009

Abstract—The glasses, in which oxygen was partially replaced with sulfur, have been synthesized in the
Na₂O–P₂O₅–Na₂S system. The chemical and chromatographic analyses of the glasses synthesized have been per-
formed. 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
beendetermined. 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 conduc-
tivities of the investigated glasses with those of the earlier studied glasses in the Na₂O–P₂O₅ system has shown
their fair coincidence. The introduction of sodium sulfide into the Na₂O–P₂O₅ 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/cm³, 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 sul-
fide ions and by the higher mobility of sodium ions in the oxygen-free matrix.

Keywords: phosphate and sulfide glasses, glass formation in the Na₂O–Na₂S–P₂O₅ and Na₂S–P₂S₅ systems,
electrical conductivity, nature of charge carriers, transfer numbers, structural chemical units

DOI: 10.1134/S1087659611030138

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