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Computational research on memory effects in AlPO4-5 nanoporous material

Gulín-González, Jorge and Demontis, Pierfranco and Navas Conyedo, Edisel and Suffritti, Giuseppe Baldovino (2012) Computational research on memory effects in AlPO4-5 nanoporous material. Journal of physics and chemistry of solids, Vol. 73 (6), p. 797-802. eISSN 1879-2553. Article.

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DOI: 10.1016/j.jpcs.2012.02.002

Abstract

Reversible amorphization and memory effects of both dense and open frameworks have received a great attention due to their prospective industrial applications. In this paper, the results of a computational study related to phase transition and memory effects in AlPO4-5 nanoporous material at high external pressure is presented. The behavior of the AlPO4-5 unit cell at high external pressures was studied by energy minimization techniques using classical potentials. A combination of interatomic potentials was used to describe the crystalline structure of the aluminophosphate. According to simulation's result a decrease of crystalline order is observed at a pressure about 3.5 GPa. The behavior of the simulated infrared spectra of compressed structures is an unambiguous evidence of structural disorder. Also, an abrupt change in the slope of the unit cell volume vs. pressure curve was obtained. At P≤3.5 GPa the process was found reversible. Contrary to what has been reported in other aluminosilicate systems the final crystalline state of AlPO4-5 at the highest simulated pressure was not amorphous. According to our knowledge this is the first evidence of a reversible first-order crystal-crystal phase transition in AlPO- family materials. This result could be important in future industrial and catalytic applications of these materials.

Item Type:Article
ID Code:8643
Status:Published
Refereed:Yes
Uncontrolled Keywords:A. microporous material, D. phase transition, D. lattice dynamics
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Elsevier
eISSN:1879-2553
Deposited On:20 Feb 2013 09:41

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