Boson peak and structural heterogeneity in ternary SiO2‐Al2O3‐B2O3 glasses. Issue 10 (22nd March 2021)

• Record Type: Journal Article
• Authors: Ando, Mariana Fatobene; Fuhrmann, Sindy; Pan, Zhiwen; Rodrigues, Bruno Poletto; Mori, Tatsuya; Ebbinghaus, Stefan G.; Wondraczek, Katrin; Kitani, Suguru; Wondraczek, Lothar
• Is Part Of: Journal of the American Ceramic Society. Volume 104:Issue 10(2021)
• Page Start: 4991
• Page End: 5000
• Publication Date: 2021-03-22
• Subjects: glass -- heterogeneity -- optical fiber -- silica -- Yb‐doping; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.17771
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: We use low‐temperature heat capacity, low‐frequency Raman scattering, and THz time domain spectroscopy in order to scale the vibrational density of states and the Boson peak in SiO2 ‐Al2 O3 ‐B2 O3 Yb‐laser host glasses. When substituting B2 O3 for SiO2 at constant Al2 O3 dopant level, we find an optimal value for the ratio of B/Al in terms of mixture stability, at which the excess in the electron donor capability of Al2 O3 (relative to the SiO2 backbone) is compensated by the more acidic B2 O3 . At this composition, Al2 O3 plays a mediating role in the structure of aluminoborosilicate glasses, facilitating dissolution of Yb2 O3 and admixture of B2 O3 into the SiO2 network.