Volume 104, Issue 6 p. 2495-2505
ORIGINAL ARTICLE

Role of vanadium oxide on the lithium silicate glass structure and properties

Anuraag Gaddam

Corresponding Author

Anuraag Gaddam

CICECO –Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, Santiago University Campus, Aveiro, Portugal

Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide, Lille, France

Correspondence

Anuraag Gaddam and José M. F. Ferreira, CICECO–Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, Santiago University Campus, Aveiro, Portugal.

Email: [email protected] (A. G.); [email protected] (J. M. F. F.)

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Amarnath R. Allu

Amarnath R. Allu

Glass Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, India

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Hugo R. Fernandes

Hugo R. Fernandes

CICECO –Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, Santiago University Campus, Aveiro, Portugal

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George E. Stan

George E. Stan

National Institute of Materials Physics, Magurele, Romania

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Catalin C. Negrila

Catalin C. Negrila

National Institute of Materials Physics, Magurele, Romania

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Atul P. Jamale

Atul P. Jamale

CICECO –Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, Santiago University Campus, Aveiro, Portugal

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François O. Méar

François O. Méar

Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide, Lille, France

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Lionel Montagne

Lionel Montagne

Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 – UCCS – Unité de Catalyse et Chimie du Solide, Lille, France

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José M.F. Ferreira

Corresponding Author

José M.F. Ferreira

CICECO –Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, Santiago University Campus, Aveiro, Portugal

Correspondence

Anuraag Gaddam and José M. F. Ferreira, CICECO–Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, Santiago University Campus, Aveiro, Portugal.

Email: [email protected] (A. G.); [email protected] (J. M. F. F.)

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First published: 04 January 2021
Citations: 9

Abstract

The structural role of V in 28Li2O–72SiO2 (in mol%) lithium silicate glass doped with 0.5 mol% V2O5 was assessed using 29Si and 51V Nuclear Magnetic Resonance (NMR), Fourier-transform infrared (FTIR), and X-ray photoelectron (XPS) spectroscopy techniques. Despite the low amount of V2O5 used, the structural information obtained or deduced from the statistical analysis of the NMR data could explain the evolution of glass properties after V2O5 addition. The XPS results indicated that all vanadium exists in 5+ oxidation state. Both the 29Si NMR and FTIR data point toward an increase in the polymerization of the silicate network, caused by the V2O5 acting as network former, capable to form various urn:x-wiley:00027820:media:jace17671:jace17671-math-0001 tetrahedral units (for n = 0, 1, and 2) in the glasses. These urn:x-wiley:00027820:media:jace17671:jace17671-math-0002 units, which are similar to phosphate units, scavenge the Li+ ions and cause the silicate network to polymerize. However, in an overall balance, the entire glass network is depolymerized due to the additional nonbridging oxygens contributed by the vanadium polyhedra. The addition of vanadium causes the network to expand and increases the ionic conductivity.