Spectroscopic and Morphological Structure of Tetrahedral Oxide Glasses

Publisher Summary This chapter examines the data on vibrational spectra to distinguish features of an n-dimensional nature, specifically n = 3 (bulk), n = 2 (internal surface), and n = 0 (point-defect) vibrational modes. It summarizes the general features of the vibrational spectrum of a tetrahedral oxide glass containing O* p,s atoms, without specifically restricting the discussion to SiO 2 or GeO 2 or to neutron, infrared, or Raman spectra. The aim is to present in the simplest possible way the essential elements of the spectra freed from the irrelevant and unnecessary computational details that arise in specific force field calculations based on specific ball-and-stick models. The chapter reviews the O* spectra of SiO 2, obtained in CRN models, and demonstrates the failure of these models to explain the data for SiO 2 . It presents specific morphological cluster models for g-SiO 2 and g-GeO 2 and shows that they are capable of explaining the O* s spectra. Quantitative results are obtained without detailed calculation for the dimensions of the clusters, their surface textures, and their interfacial spacing. These models are tested against a wide range of data and are found to be remarkably consistent with many observed phenomenological trends.

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