Glass-forming ability

Using a similar approach, Weeber and Bakker [3.8] showed, that the glassforming ability is in general governed by two criteria (1) the system has to have 

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As shown in Fig. 3, bulk Pd-Cu-P glasses also require about 20 at.% P. The palladium concentration needed to form bulk amorphous rods with diameters of 7 mm is restricted to 40 - 60 at.%, which is narrower than that for Pd-Ni-P glasses. During these tests, we noticed that upon replacing part of the Cu by Ni, the glass forming ability of the... 

AS AN AFTERGLOW SUPPRESSANT. Due to its unique glass-forming ability (i.e., from the B203 moiety), the zinc borate can also function as an afterglow suppressant as illustrated in Table... 

The Ni-Pd-Cu-P family of alloys shows among the metallic systems the highest glass-forming ability known to date (Inoue et al. 1997, Loftier 2003). 

The ternary alloys of a lanthanide with Al and a late transition metal have very high glass-forming ability and low critical cooling rate bulk samples may be cast. 

A simple method for predicting limits for glass-forming ability (GFA) in metallic alloys was proposed by Saunders and Miodownik (1983). lliey utilised the To criterion to predict the limit to the glass-forming range (GFR) of a number of binary and ternary systems. The To criterion follows the premise diat, if cooling conditions... 

A reduced glass temperature can be defined as T, = TJTi. which represents a measure of glass-forming ability. The higher the Tt and the lower the liquidus temperature. T. the easier it is to supercool the inelal melt to a glassy stale. Conventional theory predicts 7.= 0 65 — 0.7 for good glass formers. 

Nanocrystalline Fe g4-9 i (Cu ] )-(Zr,Nb) 7B2 9 alloys appear even more interesting due to their still higher saturation magnetization of up to 1.7 Tesla. However, their application so far is limited to smaller quantities. One of the major reasons is that they require a much more sophisticated production technology due to their limited glass forming ability and/or the oxygen reactivity of the Zr addition. 

The analysis of the BOs for the amorphous and crystal structures helps the estimation of the glass-forming abilities. 

A 3-D framework analogous to the Si02 cristobalite stmcture is of course easy to build from elementary tetrahedra. Notice that, in the Ge/S system, the glass-forming ability is maximum for the composition GeS4 which corresponds to tetrahedra coimected by a S-S pairs bonds. 

Fluoride glasses can be classified according to structural considerations and although glass-forming ability has been observed in many fluorides they caimot be considered of equal interest because of the high tendency for most of them to devitrify. 

Glass-forming ability has been also observed in several Zr-free fluoride systems, like in In-based glass systems whose... 

A salient property of pol3mieric liquids is their glass forming ability, and this has played a central role in attempts to account for the temperature dependence of the viscosity. Recent developments on the dependence of the viscosity on temperature stem largely from the observation of Doolittle (5. 78, 79, 80, 81) that viscosity data on normal paraffins could be correlated by the expression... 

SX Wang et al. (1998) have developed a parameter, S, to address the susceptibility to amorphization for oxides based on the analysis of glass-forming ability. The S parameter combines three factors the structural connectivity, bond strength, and thermodynamic stability. The use of the three factors is based on a consideration of their affect on the tendency of the damaged regions to recrystallize. The S parameter is defined as ... 

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