The rheology of collapsing zeolites amorphized by temperature and pressure


Autoria(s): Greaves, George; Meneau, F.; ap Gwynn, Iolo A.; Wade, S.
Contribuinte(s)

Institute of Mathematics & Physics (ADT)

Institute of Biological, Environmental and Rural Sciences

Mathematics and Physics

Data(s)

09/12/2008

09/12/2008

24/08/2003

Resumo

Greaves, G.; Meneau, F.; ap Gwynn, I.A.; Wade, S., (2003). The rheology of collapsing zeolites amorphized by temperature and pressure. Nature Materials 2, 622-629. RAE2008

Low-density zeolites collapse to the rigid amorphous state at temperatures that are well below the melting points of crystals of the same composition but of conventional density. Here we show, by using a range of experimental techniques, how the phenomenon of amorphization is time dependent, and how the dynamics of order?disorder transitions in zeolites under temperature and pressure are equivalent. As a result, thermobaric regions of instability can be charted, which are indicative of polyamorphism. Moreover, the boundaries of these zones depend on the rate at which temperature or pressure is ramped. By directly comparing the rheology of collapse with structural relaxation in equivalent melts, we conclude that zeolites amorphize like very strong liquids and, if compression occurs slowly, this is likely to lead to the synthesis of perfect glasses.

Peer reviewed

Formato

8

Identificador

Greaves , G , Meneau , F , ap Gwynn , I A & Wade , S 2003 , ' The rheology of collapsing zeolites amorphized by temperature and pressure ' Nature Materials , vol 2 , pp. 622-629 . DOI: 10.1038/nmat963

1476-4660

PURE: 89707

PURE UUID: d69f3ef3-1776-47d9-b719-3170ab2d388e

dspace: 2160/1496

http://hdl.handle.net/2160/1496

http://dx.doi.org/10.1038/nmat963

Idioma(s)

eng

Relação

Nature Materials

Tipo

/dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article

Article (Journal)

Direitos