Issue 29, 2019

High refractive index La-rich lanthanum borate glasses composed of isolated BO3 units

Abstract

La2O3–B2O3 binary glasses were prepared by containerless processing using a levitation technique. The bulk glass-forming region in a B-rich composition was extended compared to that using conventional melt-quench techniques. Furthermore, additional glass formation was realized in an La-rich composition. The glass transition temperature and crystallization temperature of La-rich glasses are much higher than those of B-rich glasses. Both B- and La-rich glasses were colorless and transparent and had a high refractive index with low wavelength dispersion in the visible region. With the increase of the La2O3 content, the optical absorption edge in the ultraviolet (UV) region shifts to a long wavelength. An additional infrared (IR) transmittance window was observed in La-rich glasses, indicating that the La-rich borate glasses are expected to be used in optical components in a wide wavelength region. Local structural analyses using 11B magic-angle spinning (MAS) nuclear magnetic resonance (NMR) and Raman scattering spectra revealed that every B-atom in La-rich glasses formed a planar trigonal BO3 unit and these BO3 units were entirely isolated. The evident difference from B-rich glasses where B-atoms formed a complex network structure with BO3 and BO4 units caused the characteristic physical and optical properties of La-rich glasses.

Graphical abstract: High refractive index La-rich lanthanum borate glasses composed of isolated BO3 units

Article information

Article type
Paper
Submitted
24 Apr 2019
Accepted
07 Jun 2019
First published
18 Jun 2019

Dalton Trans., 2019,48, 10804-10811

High refractive index La-rich lanthanum borate glasses composed of isolated BO3 units

A. Masuno, T. Iwata, Y. Yanaba, S. Sasaki, H. Inoue and Y. Watanabe, Dalton Trans., 2019, 48, 10804 DOI: 10.1039/C9DT01715A

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