93Nb NMR Study of (K, Na)NbO3-Doped SiO2–Na2O–Al2O3 Glasses

Otsuka T, Cicconi MR, Dobesh D, Schroeder B, Hayakawa T (2022)

Publication Type: Journal article

Publication year: 2022

Journal

physica status solidi (b) Wiley

DOI: 10.1002/pssb.202200016

Abstract

Aluminosilicate glasses containing octahedral NbO6 units are developed for future applications as optical materials. Soda-aluminosilicate glasses doped with Nb-based alkaline perovskite crystals (K0.5Na0.5NbO3 [KNN]) at different doping levels (2–30 mol%) are studied by 93Nb nuclear magnetic resonance (NMR) spectroscopy. The Al2O3 concentration in the starting soda-aluminosilicate glass matrix is varied from 5 to 17 mol% to investigate the influence of the composition of local Nb structures with 4–5, 6, and 7–8 fold-oxygen coordination on the optical properties of the glasses. The chemical shifts are analyzed by comparison with the 93Nb NMR data of reference crystals, including KNN, to determine the feasibility of producing more NbO6 octahedra in the aluminosilicate glasses, where these octahedra are expected to promote the development of optically active Nb-glass-ceramics. The data show that both glass polymerization and KNN content influence the Nb local environment. Therefore, an appropriate amount of Al2O3 combined with an adequate doping level of the KNN perovskite is required to achieve the desired optical features. Contrary to expectations, a higher KNN doping level is achieved with the starting depolymerized soda-aluminosilicate glass containing 5 mol% Al2O3, leading to perovskite-like structures of NbO6 octahedra in the resultant glass system.

Authors with CRIS profile

Maria Rita Cicconi Lehrstuhl für Glas und Keramik David Dobesh Professur für Werkstoffwissenschaften (Glas und Keramik)

Additional Organisation(s)

Graduiertenkolleg 2495 Energiekonvertierungssysteme: von Materialien zu Bauteilen (Energy Conversion Systems: From Materials to Devices)

Related research project(s)

Formulation and Crystallization of Perovskite Bearing Glass-Ceramics for Light Management (Project G IGK 2495) IGK 2495: Energy Conversion Systems: From Materials to Devices (IGK 2495) Jan. 1, 2020 - June 30, 2024

Involved external institutions

Nagoya Institute of Technology / 名古屋工業大学 Nagoya Kōgyō Daigaku JP Japan (JP)

How to cite

APA:

Otsuka, T., Cicconi, M.R., Dobesh, D., Schroeder, B., & Hayakawa, T. (2022). 93Nb NMR Study of (K, Na)NbO3-Doped SiO2–Na2O–Al2O3 Glasses. physica status solidi (b). https://dx.doi.org/10.1002/pssb.202200016

MLA:

Otsuka, Takahito, et al. "93Nb NMR Study of (K, Na)NbO3-Doped SiO2–Na2O–Al2O3 Glasses." physica status solidi (b) (2022).

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