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

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• 作者：1. St. Petersburg State Institute of Technology (Technical University) ; Moskovskii pr. 26 ; St. Petersburg ; 190013 Russia2. St. Petersburg State Polytechnical University ; Politekhnicheskaya ul. 29 ; St. Petersburg ; 195251 Russia3. St. Petersburg State University ; Universitetskii pr. 2 ; Petrodvorets ; St. Petersburg ; 198504 Russia
• 关键词：phosphate and sulfide glasses &#8211 ; glass formation in the Na2O ; Na2S ; P2O5 and Na2S ; P2S5 systems &#8211 ; electrical conductivity &#8211 ; nature of charge carriers &#8211 ; transfer numbers &#8211 ; structural chemical units
• 刊名：Glass Physics and Chemistry
• 出版时间：June 2011
• 出版年：2011
• 期刊代码：23_03605043
• 类别：mat
• 卷：37
• 期：3
• 页码：263-282
• 数据来源：sp

摘要

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 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 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 sulfide ions and by the higher mobility of sodium ions in the oxygen-free matrix.