By N. J. Kreidl (auth.), L. D. Pye, V. D. Fréchette, N. J. Kreidl (eds.)
Boron Oxide performs a key function in several glasses of excessive technological significance, but its position in glass constitution is much from transparent. certainly, in recent times there were critical chal lenges to past constitution thoughts for either crystalline and glassy borates. those demanding situations have been enough to warrant a re exam of the constitution of borate glasses utilizing the main pow erful instruments at present on hand. to supply an appropriate discussion board for this project, a four-day convention on "Boron in Glass and Glass Ceramics" was once convened at Alfred college, June 3-8, 1977 to check the easiest medical pondering on constitution and to discuss conflicting perspectives and speak about houses and purposes of borate glasses. This convention used to be additionally the 1st in a brand new college sequence on Glass technology to be circled between Alfred college, The Pensyl vania kingdom college, Rensselaer Polytechnic Institute, and the collage of Missouri-Rolla. the current quantity represents the complaints of the 1st convention during this sequence. the quantity starts off with a overview of the amazing contribution of Jan Krogh-Moe to the certainty of the constitution of Borate glasses. This assessment, authored by way of Professor N. J. Kreidl, concludes through dedicating the complaints of this convention as a Krogh-Moe Fest schrift. the quantity maintains with a old assessment through D. L. Griscom, initially ready for move to the individuals ahead of the convention. An Epilogue to the outlet bankruptcy brings the survey up to date in mild of the convention papers.
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Additional resources for Borate Glasses: Structure, Properties, Applications
L. GRISCOM arrangements in the material sele cted for study. Whether or not it really is depends on many things, e. , how well the sample is characterized, how big are the errors in the raw experimental data, how reasonable is the mathematical data processing (and to what degree this proce ssing avoids magnification of the experimental errors), and how rigorous is the theory used to relate the model with the refined data. Most of the experiments to be de scribed are actually quite well developed so that experimental errors are usually small and the requisite data proce ssing is reliable.
With Compton modified scattering removed, and the replacement of the "proportionality of BORATE GLASS STRUCTURE 55 scattering factors" approximation by an exact formulation in terms of pair functions (118). In analogy with Fig. 8, the essential steps in Mozzi and Warren's work are graphically presented in Fig. 9 (see page 46). Here it can be seen that Step (4) includes a new substep, namely, the synthesis of the RDF by means of a superposition of rigorously calculated pair function distribution curve s (PFD).
9R) (34), Sr ions tend to pair in strontium borate glasses (dave~6. 6R) (35), and Tl ions tend to pair in thalium borate glas se s (dave ~ 7. 1 (36). Krogh-Moe (36) has emphasized, however that these results add little to our knowledge of the glas sy network on an extended scale, i. , they tell us little about the nature of any boron-oxygen structural groupings which happen to be present. A similar caution was noted by Block and Piermarini (35). R) It is corre ct to infer from the foregoing discussion that X-ray diffraction studies of borate glasses dating before 1970 have produced very little information relating to the boron-oxygen network other than reasonably firm evidence for the existence of B03 triangles in B203 glass and complex glasses of low modifier content.
Borate Glasses: Structure, Properties, Applications by N. J. Kreidl (auth.), L. D. Pye, V. D. Fréchette, N. J. Kreidl (eds.)