Composition dependence of the local structure and transparency of Gd2O3–B2O3 binary glasses prepared via aerodynamic levitation

SASAKI Shunta, MASUNO Atsunobu

doi:10.2109/jcersj2.21124

Gd₂O₃–B₂O₃ binary glasses with a wide composition range were fabricated using a levitation technique, which allowed the Gd₂O₃ content of the glasses to be increased to 60 mol %, which is much greater than possible using conventional melt-quenching techniques. The composition dependence of the thermal, optical, and vibrational properties of the Gd₂O₃–B₂O₃ binary glasses was investigated. The glass transition and crystallization temperatures decreased slightly in the B-rich region with increasing Gd₂O₃ content in the glasses, whereas they increased in the Gd-rich region. Both B- and Gd-rich glasses were found to be colorless and transparent over a wide range of visible to near-infrared radiation. With an increase in the Gd₂O₃ content, the optical absorption edge in the ultraviolet region shifted toward a longer wavelength. Additional infrared (IR) transmittance windows were observed in the Gd-rich region. Raman scattering and IR spectra revealed that in the Gd-rich glasses, all of the B atoms formed isolated BO₃ units and the signals for the BO₄ units disappeared. It was concluded that the characteristic local structure around the B atoms is the origin of the additional IR transparency. These results show that by adjusting the Gd₂O₃ content, the resultant borate glasses are expected to be applied as optical components for use over various wavelengths.

Composition dependence of the local structure and transparency of Gd<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub> binary glasses prepared via aerodynamic levitation

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