Ionic conductivity and mixed-ion effect in mixed alkali metaphosphate glasses

Author(s)

Esquina Tsuchida, Jefferson ; Aparecido Ferri, Fabio ; Sergio Pizani, Paulo ; Martins Rodrigues, Ana Candida ; Kundu, Swarup ; Fabian Schneider, Jose ; Dutra Zanotto, Edgar

• Document type: Journal article
• Source: Physical Chemistry Chemical Physics; v. 19, n. 9, p. 6594-6600, MAR 7 2017.
• Web of Science Citations: 3

Abstract

In this work, mixed alkali metaphosphate glasses based on K-Na, Rb-Na, Rb-Li, Cs-Na and Cs-Li combinations were studied by differential scanning calorimetry (DSC), complex impedance spectroscopy, and Raman spectroscopy. DSC analyses show that both the glass transition (T-g) and melting temperatures (T-m) exhibit a clear mixed-ion effect. The ionic conductivity shows a strong mixed-ion effect and decreases by more than six orders of magnitude at room temperature for Rb-Na or Cs-Li alkali pairs. This study confirms that the mixed-ion effect may be explained as a natural consequence of random ion mixing because ion transport is favoured between well-matched energy sites and is impeded due to the structural mismatch between neighbouring sites for dissimilar ions. (AU)

• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 12/24802-6 - Structure and nucleation mechanisms in oxide glasses: Approach using Nuclear Magnetic Resonance
• Grantee: Jefferson Esquina Tsuchida
• Support Opportunities: Scholarships in Brazil - Post-Doctoral