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Rotational-echo double-resonance NMR is used to probe the proximity of Cs + network modifiers to network-forming boron in binary cesium borate glasses. Low- and high-alkali glasses show distinctly different dephasing curves, which indicate preferential association of Cs + with four-co-ordinate boron ( [4] B) at low-alkali contents only. Different [4] B sites within...
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