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Structure of Rubidium Borosilicate Glasses Studied by Nuclear Magnetic Resonance Spectroscopy

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We present results of an 11B and 29Si nuclear magnetic resonance (NMR) spectroscopy study of the local anion structure of a series of borosilicate glasses in the Rb2O–B2O3–SiO2 system with different R = [Rb2O]/[B2O3] and K = [SiO2]/[B2O3] molar ratios. Relative integrated intensities of NMR lines are used to evaluate the fractions of boron atoms in three- and fourfold coordinations and the concentrations of various types of Qn silicate units. Comparison of the present data on the anion structure of the Rb2O–B2O3–SiO2 glasses studied here and data for previously studied glasses of analogous compositions in the Cs2O–B2O3–SiO2 system demonstrates that the difference in the degree of depolymerization in the anion structure of the glasses in these two systems is most pronounced at R = 1 and K = 2. At other values of these composition parameters (R = 0.43 and K = 1.43 or R = 2.33 and K = 3.33), the glasses with the compositions studied in the Rb2O–B2O3–SiO2 and Cs2O–B2O3–SiO2 systems are rather similar in local anion structure. The observed structural distinctions between the glasses make it possible to find out why they differ in glass transition temperature, as shown in a previous study by differential scanning calorimetry.

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ACKNOWLEDGMENTS

This work was supported by the Russian Federation Ministry of Education and Science (project no. 11.9643.2017/8.9 and state research target no. 015-00613-019-00).

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Correspondence to V. E. Eremyashev.

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Translated by O. Tsarev

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Eremyashev, V.E., Mazur, A.S., Tolstoi, P.M. et al. Structure of Rubidium Borosilicate Glasses Studied by Nuclear Magnetic Resonance Spectroscopy. Inorg Mater 55, 500–505 (2019). https://doi.org/10.1134/S0020168519050054

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  • DOI: https://doi.org/10.1134/S0020168519050054

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