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This paper describes a new approach to answer the question posed in the title, which has remained unanswered for a long time. We provide estimates of the glass forming tendencies (GFT) of a variety of materials in terms of G values. The G value of a material is determined by a combination of at least three factors; bond energies, structures and viscosities. A functional form of G is proposed and is calculated using minimum and readily available physicochemical parameters. G appears to quantify GFT on a universal scale and rationalize known GFTs in both single and multicomponent materials. (G is also shown to have a predictive potential.) [Copyright &y& Elsevier]

A microwave method has been developed for the preparation and sintering of lithium lanthanum titanate (LLTO) of the formula Li0.35La0.55TiO3. The method is fast, clean, economical and gives phase pure product of high conductivity. [Copyright &y& Elsevier]