Ultrahigh-field Zn NMR reveals short-range disorder in zeolitic imidazolate framework glasses.

The structure of melt-quenched zeolitic imidazole framework (ZIF) glasses can provide insights into their glass-formation mechanism. We directly detected short-range disorder in ZIF glasses using ultrahigh-field zinc-67 solid-state nuclear magnetic resonance spectroscopy. Two distinct Zn sites characteristic of the parent crystals transformed upon melting into a single tetrahedral site with a broad distribution of structural parameters.

Observation of polymer-like flow mechanism in a short-chain phosphate glass-forming liquid.

The dynamics of the phosphate chains and the attendant shear relaxation in a short-chain silver phosphate glass-forming liquid with the composition 51.5%AgO-48.5% PO are studied using a combination of high-temperature P NMR spectroscopy and parallel plate rheometry.