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- W2085788045 abstract "Glasses along the join NaAlSi3O8-NaBSi3O8 and the end-member crystalline phases albite and reedmergnerite were investigated using 11B, 23Na, 27Al and 29Si MAS NMR spectroscopy and oxide-melt solution calorimetry. The glasses have substantial positive enthalpies of mixing described by the equation ΔHmix (kcal · mol t̄1) = 4.4(±1.0)X(1 − X), where X is the mole fraction Rd component. 11B MAS NMR spectra show that boron occurs in both trigonal and tetrahedral coordination in the glasses, with the percentage of B in trigonal coordination decreasing from about 60% at Rd20Ab80 to about 29% at Rd100. Thus, the glasses are structurally more complex than the end-member crystals which are tetrahedral framework minerals. The NMR data suggest that all or most of the Si, Al and tetrahedral B occur in Q4 (framework) sites. They are also consistent with the ideas that most of the tetrahedral B does not extensively copolymerize with trigonal boron, that at least some of the non-bridging oxygens formed by the presence of trigonal boron are located on SiO4 tetrahedra, and that Si and trigonal B do not occur as next-nearest neighbors. Both the NMR and the ΔHmix results indicate the presence of clustering. Such clustering might involve separation into framework regions and regions dominated by trigonal boron and/or into B-rich and Al-rich framework regions." @default.
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- W2085788045 date "1988-10-01" @default.
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- W2085788045 title "Thermochemistry and structure of glasses along the join NaAlSi3O8-NaBSi3O8" @default.
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- W2085788045 doi "https://doi.org/10.1016/0016-7037(88)90297-9" @default.
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