Cesium borate glasses

To probe the potential influence of cation size differences on the distribution, Na[ Cs SEDOR experiments have also been conducted on mixed sodium cesium borate glasses containing 30 mol% alkali [57]. Being a nucleus (1=7/2) with a moderately small nuclear electric quadrupolar moment, the Cs nucleus features similar spectroscopic characteristics as Li. Usually sizeable first-order quadrupolar splittings reduce the inversion efficiency of the n-... 

Holland et used rotational-echo double-resonance NMR 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 (B-[4]) at low-alkali contents only. Different B-[4] sites within a given glass appear to be subject to the same Cs dipolar field, thus... 

P. M. Aguiar and S. Kroeker. Medium-range order in cesium borate glasses probed by double-resonance NMR. Solid-State NMR Spectr. 27, 2005,10. 

S. Kroeker, S. A. FeUer, M. Affatigato, C. O Brien, W. Clarida and M. Kodama. Multiple four-coordinated boron sites in cesium borate glasses and their relation to medium-range order. Phys. Chem. Glasses 44, 2003, 54. 

Figure 6.10. N4 as a function of R for alkali borate glasses. L = lithium, N = sodium, K= potassium, R = rubidium, C = cesium and B = borate. Unhatched block in mixed alkali compositions represent excess N4. (After Zhong and Bray, 1989).

VIOLET Potassium compounds other than silicates, phosphates and borates rubidium and cesium are similar. Color is masked by lithium and/or sodium, appears purple-red through cobalt glass and bluish-green glass. 

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