Zinc borate glasses: properties, structure and modelling of the composition-dependence of borate speciation. Issue 8 (8th February 2023)

• Record Type: Journal Article
• Authors: Topper, Brian; Möncke, Doris; Youngman, Randall E.; Valvi, Christina; Kamitsos, Efstratios I.; Varsamis, Christos P. E.
• Is Part Of: Physical chemistry chemical physics. Volume 25:Issue 8(2023)
• Page Start: 5967
• Page End: 5988
• Publication Date: 2023-02-08
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d2cp05517a
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : The short-range order of binary zinc borate glasses, x ZnO–(1 − x )B2 O3, has been quantitatively described as a function of ZnO content over the entire glass forming range for the first time, to the best of our knowledge. Abstract : The short-range order of binary zinc borate glasses, x ZnO–(1− x )B2 O3, has been quantitatively described as a function of ZnO content over the entire glass forming range for the first time, to the best of our knowledge. Multiple spectroscopic techniques ( 11 B NMR, Raman, infrared) reveal detailed structural information regarding borate speciation and network connectivity, and a new model for quantifying the molar fractions of short-range order units is proposed. A consistent thermal history dependence for the fraction of tetrahedral boron ( N 4 ) is well accounted for by the proposed model. The model predicts density within 0.1% of experimental values and N 4 to within 1% of NMR values. The intermediate character of four-coordinated zinc in borate glasses of this series is evident by the far infrared profiles and the glass transition temperature behavior, which decreases non-monotonically with increasing ZnO content.