who provide the evolution. of valence bond on interface of noble gas
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The bond-valence approach [28] has proven to be a powerful tool for the prediction and interpretation of bond lengths in solids. Burns et al. [19] presented revised bond-valence parameters derived from uranyl polyhedra in well-refined structures. These parameters facilitate calculations in the case of U6+, as previously proposed parameters generally performed poorly. Burns et al. [19] provided bond valence parameters that were optimized over all uranyl polyhedra, as well as those that are coordination specific. The coordination specific parameters for six-coordinated U6+ are Rij = 2.074 Å, b = 0.554 Å; for seven-coordinated U6+ Rij = 2.045 Å, b = 0.510 Å; for eight-coordinated U6+ Rij = 2.042 Å, b = 0.506 Å. Optimal parameters for all types of U6+ polyhedra are Rij = 2.051 Å, b = 0.519 Å.
Schindler and Hawthorne [29] presented novel insights into the chemical composition and occurrence of uranyl oxide hydrates using a combined binary representation and bond-valence approach. In essence, this approach looks for conditions of overlap of the bonding requirements emanating from the structural unit and interstitial components. The outcome is a series of predicted compositions and mineral stabilities.