Show simple item record F. en_US O. en_US George en_US D. G. en_US 2008-12-10T08:53:37Z 2008-12-10T08:53:37Z 2005-05-27 en_US
dc.identifier en_US
dc.identifier.citation Meneau , F , Majerus , O , Greaves , G & Jones , D G 2005 , ' Identifying vibrations that destabilize crystals and characterize the glassy state ' Science , vol 308 , pp. 1299-1302 . , 10.1126/science.1109411 en_US
dc.identifier.other PURE: 89960 en_US
dc.identifier.other dspace: 2160/1497 en_US
dc.description.abstract High-resolution inelastic neutron scattering was used to identify major sources of low-frequency vibrations in zeolite crystals. Dispersed and nondispersed modes were found, both of which are prominent in the early stages of compressive amorphization but decline dramatically in strength once a glass of conventional density is created. By identifying the dispersed modes with the characteristic vibrations of the various secondary building units of zeolitic structures, the Boson peak, a characteristic of the glassy state, can be attributed to vibrations within connected rings of many different sizes. The nondispersed phonon features in zeolites, retained in the amorphized glass, were also replicated in silica. These modes are librational in origin and are responsible for destabilizing the microporous crystalline structure, for converting the resulting glass from a low- to a high-density phase, and for the associated changes in network topology that affect the Boson peak. en_US
dc.format.extent 4 en_US
dc.relation.ispartof Science en_US
dc.title Identifying vibrations that destabilize crystals and characterize the glassy state en_US
dc.contributor.pbl Institute of Mathematics & Physics (ADT) en_US
dc.contributor.pbl Institute of Biological, Environmental and Rural Sciences en_US
dc.contributor.pbl Mathematics and Physics en_US

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