2014/04/01 by G. D. Gatta, G. Diego Gatta, Yongjae Lee +1
Chemistry · Earth and Planetary Sciences · Materials Science · #Crystal Structures and Properties #High-pressure geophysics and materials #Zeolite Catalysis and Synthesis
paper · doi:10.1180/minmag.2014.078.2.04
crossref issued 2014/04/01 · crossref published 2014/04/01 · crossref published-print 2014/04/01 · openalex publication_date 2014/04/01 · crossref created 2014/05/29 · crossref published-online 2018/07/05 · crossref deposited 2022/04/05 · openalex created_date 2025/10/10 · crossref indexed 2026/07/30 · openalex updated_date 2026/08/01
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.