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- W1981010579 abstract "The field strength of modifier cations in boron-containing oxide glasses has important but complex effects on boron coordination, and has long been known to have major effects on glass and liquid properties. With well-constrained compositional and fictive temperature information in three binary borate glass series, we report how different modifier cations (Na+, Ba2+, Ca2+) affect boron coordination (11B MAS NMR), as well as glass transition temperatures and configurational heat capacities (DSC). Using estimated reaction enthalpies for converting a [4]B to a [3]B with an NBO from previous studies, we compare boron coordinations in glasses with different modifier cations on an isothermal basis. Temperature and modifier cation effects can thus be isolated. At low modifier contents [R = (Na2,Ca,Ba)O/B2O3 Ba>Ca, suggesting the enhanced stabilization of NBO for the divalent cations, especially for the smaller Ca2+. At higher R values, N4 for Na borates drops below values for Ca and Ba borates. The trend in N4 with modifier field strength reverses at high R values (~ R > 0.7), with Ca > Ba > Na. The transition may be related to the enhanced stabilization of [4]B-O-[4]B groups by higher field strength cations in NBO-rich glasses in which boron is the primary network component." @default.
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- W1981010579 date "2014-07-25" @default.
- W1981010579 modified "2023-10-16" @default.
- W1981010579 title "Cation Field Strength Effects on Boron Coordination in Binary Borate Glasses" @default.
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- W1981010579 doi "https://doi.org/10.1111/jace.13100" @default.
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