A new way of making glass

Nov 09, 2012
A new way of making glass
Making glass by changing the structure of a liquid. Left: normal liquid alloy of nickel (silver) and phosphorous (orange) atoms. Encouraging atoms to form bicapped square antiprisms (inset) turned the liquid into a solid glass (right) where the nickel (turquoise) and phosphorous (green) atoms in antiprisms are drawn larger

(Phys.org)—A new way to make glass has been discovered by a collaboration of researchers at the Universities of Düsseldorf and Bristol using a method that controls how the atoms within a substance are arranged around each other. The research is published today in Physical Review Letters.

When cooling a liquid below its it either crystallizes or transforms into a glass. Glass is a peculiar : it has the mechanical properties of a solid but an amorphous structure like a liquid.

As long ago as 1952, Sir Charles Frank at the University of Bristol argued that the structure of glasses should not be entirely disordered like a liquid but rather that it should be filled with polyhedra like the bicapped square antiprism.

Although such motifs have very recently been found in experiments and computer simulations on glassy materials, it has not been clear what role these play in how a liquid becomes a (glassy) solid.

The Düsseldorf and Bristol researchers created a new type of glass in a computer by encouraging atoms in a molten nickel-phosphorous alloy to form the pictured . When these polyhedra formed, the liquid no longer flowed – it had become a solid. In other words, they found that instead of cooling, a liquid can turn into a glass by changing its structure.

Dr Paddy Royall of the University of Bristol said: "The method we developed employed of liquids, performed on the University of Bristol's BlueCrystal supercomputer, where the atoms were driven to form more polyhedra.

"Although many more polyhedra were formed, the were still disordered rather than a periodic arrangement as seen in crystals. This means that the solid that was formed had to be a glass."

Dr Thomas Speck of Heinrich-Heine-Universität, Düsseldorf said: "These results mean that structure can control whether a material is liquid or solid and thus open the way to design new glasses: for example metallic glasses whose great lightness and strength promise exciting applications and chalcogenide glasses which are used in memory applications and phase switch memory, a possible future technology for data storage."

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More information: 'First-order phase transition in a model glass former: coupling of local structure and dynamics' by T Speck, A Malins and CP Royall in Physical Review Letters. prl.aps.org/abstract/PRL/v109/i19/e195703

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PleonasticAxiom
1 / 5 (1) Nov 09, 2012
Amazing!
Walter_Mrak
not rated yet Nov 09, 2012
" it has not been clear what role these play " It Has Not Been Clear
del2
not rated yet Nov 09, 2012
'phosphorous' - should be 'phosphorus'
VINDOC
3 / 5 (2) Nov 09, 2012
Computer simulations can be completely different then real world practises. A metalic glass can change everything from cooking appliances to space travel. Time to try real world development.
Torbjorn_Larsson_OM
not rated yet Nov 10, 2012
From clarity to clarity - liquid to glass. (Spinning of Walter Mrak.)
wee e
5 / 5 (1) Nov 10, 2012
'phosphorous' - should be 'phosphorus'

Unless it's British English you're writing, when 'phosphorous' is correct.