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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V. Eremyashev

South Ural State University; Institute of Mineralogy, Ural Branch, Russian Academy of Sciences

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Email: eremiashevve@susu.ru
俄罗斯联邦, pr. Lenina 76, Chelyabinsk, 454080; Miass, Chelyabinsk oblast, 456317

A. Mazur

Magnetic Resonance Research Centre, Research Park, St. Petersburg State University

Email: eremiashevve@susu.ru
俄罗斯联邦, Universitetskii pr. 26, St. Petersburg, 198504

P. Tolstoi

Magnetic Resonance Research Centre, Research Park, St. Petersburg State University

Email: eremiashevve@susu.ru
俄罗斯联邦, Universitetskii pr. 26, St. Petersburg, 198504

L. Osipova

Institute of Mineralogy, Ural Branch, Russian Academy of Sciences

Email: eremiashevve@susu.ru
俄罗斯联邦, Miass, Chelyabinsk oblast, 456317

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