Zeolites at high pressure: A review

G. D. Gatta, Y. Lee

Research output: Contribution to journalReview article

56 Citations (Scopus)

Abstract

This is a review of the elastic behaviour and pressure (P)-induced structural evolution of zeolites and presents a comparative analysis of the deformation mechanisms of the Si/Al-framework and the rearrangement of the extra-framework species in response to applied pressure. The interaction between P-transmitting fluids and zeolites, which can lead to phenomena such as P-induced over-hydration, is described. The comparative elastic analysis and the high-P structural data of zeolites reported so far allow us to make some generalizations: (1) The range of compressibility among this class of openframework silicates is large, with bulk moduli ranging between 15 and 70 GPa; (2) Microporosity does not necessarily imply high compressibility, as several zeolites are less compressible than other nonzeolitic rock-forming minerals; (3) Compressibilities of zeolites do not seem to be directly related to microporosity, at least if we model microporosity with the framework density; (4) The flexibility observed in zeolites under hydrostatic compression is mainly governed by tilting of rigid tetrahedra around O atoms that behave as hinges within the framework. Pressure-induced tilting commonly leads to continuous rearrangement of the framework without any phase transition. More rarely, tilting induces displacive phase transitions and isothermal P-induced reconstructive phase transitions (i.e. with change in framework topology), have not been reported in this class of materials; (5) Deformation mechanisms in response to applied pressure are generally dictated by the topological configuration of the framework rather than the Si/Al-distribution or the extra-framework content. The channel content governs the compressibility of the cavities, leading to different unit-cell-volume compressibilities in isotypic structures.

Original languageEnglish
Pages (from-to)267-291
Number of pages25
JournalMineralogical Magazine
Volume78
Issue number2
DOIs
Publication statusPublished - 2014 Apr

Fingerprint

Zeolites
compressibility
Compressibility
Microporosity
phase transition
deformation mechanism
Phase transitions
bulk modulus
Silicates
hydration
hydrostatics
topology
Hinges
cavity
Hydration
Density (specific gravity)
silicate
compression
Minerals
Elastic moduli

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

Gatta, G. D. ; Lee, Y. / Zeolites at high pressure : A review. In: Mineralogical Magazine. 2014 ; Vol. 78, No. 2. pp. 267-291.
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Zeolites at high pressure : A review. / Gatta, G. D.; Lee, Y.

In: Mineralogical Magazine, Vol. 78, No. 2, 04.2014, p. 267-291.

Research output: Contribution to journalReview article

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