{"id":204,"date":"2020-02-14T19:15:18","date_gmt":"2020-02-14T19:15:18","guid":{"rendered":"http:\/\/cdmf.org.br\/en\/?p=204"},"modified":"2020-02-14T19:16:49","modified_gmt":"2020-02-14T19:16:49","slug":"study-refines-computer-simulation-of-crystal-solids","status":"publish","type":"post","link":"https:\/\/cdmf.org.br\/en\/2020\/02\/14\/study-refines-computer-simulation-of-crystal-solids\/","title":{"rendered":"Study refines computer simulation of crystal solids"},"content":{"rendered":"\n

By Jos\u00e9 Tadeu Arantes  |  Ag\u00eancia FAPESP<\/strong> \u2013 Describing and explaining the electronic properties of certain crystalline materials that have a three-dimensionally ordered atomic structure can be complicated owing to the large number of atoms involved, each with a large number of electrons. Simplified models that have been developed for this purpose include density functional theory (DFT), derived from quantum mechanics and used in solid-state physics and chemistry to resolve many-body systems. In DFT, the properties of systems with many electrons are determined by means of functionals, i.e., functions of another function, which in this case is the spatial distribution of the electron density.<\/p>\n\n\n\n

First proposed in an article published in 1964 by Austrian-born American physicist and chemist Walter Kohn (1923-2016) and French-born American physicist Pierre Hohenberg (1934-2017), DFT has been widely applied thanks to advances in computational resources. Kohn was awarded the 1998 Nobel Prize for Chemistry in recognition of his role in creating DFT.<\/p>\n\n\n\n

However, the methods still need to be refined to obtain more realistic computational modeling. This was the goal of a study conducted in Brazil with support by FAPESP<\/strong><\/a>, whose results were published<\/strong><\/a> in Computational Materials Science<\/em>. The principal investigator for the study was Julio Ricardo Sambrano<\/strong><\/a>, who leads the Computational Modeling and Simulation Group at S\u00e3o Paulo State University\u2019s School of Sciences (FC-UNESP) at Bauru. Another scientist who made an important contribution to the study was Professor Elson Longo<\/strong><\/a>, director of the Center for the Development of Functional Materials (CDMF<\/strong><\/a>), one of the Research, Innovation and Dissemination Centers (RIDCs<\/strong><\/a>) supported by FAPESP. The CDMF is hosted by the Federal University of S\u00e3o Carlos (UFSCar) in S\u00e3o Paulo State, Brazil.<\/p>\n\n\n\n

The material considered in the study was barium molybdate (BaMoO4<\/sub>), chosen for its potential technological application to luminescence and to the degradation of organic compounds. BaMoO4<\/sub> is currently used as an adhesive agent for enamelware and to remove sulfur from naphtha (a refined petroleum product) in the production of gases. <\/p>\n\n\n\n

Ag\u00eancia FAPESP<\/strong> interviewed Sambrano and Longo about the study.<\/p>\n\n\n\n

Ag\u00eancia FAPESP \u2013 Why is it difficult to describe and explain the properties of certain crystalline materials?<\/strong><\/em>
Julio Ricardo Sambrano<\/strong> \u2013 Crystalline materials have a three-dimensionally ordered structure with a large number of atoms, each of which consists of several electrons, and each of these electrons can be represented by a mathematical function. Ideally, we should be able to obtain a computational model that accurately describes the crystal system, i.e., to design a model that considers all the forces at work in the system. Unfortunately, however, this task just is not feasible with the theoretical models we have and the computing capacity available. In the near future, it may be feasible, especially when quantum computing is developed further. For example, quantum mechanics calculations currently perform certain approximations, such as considering atomic nuclei to be fixed, whereas in fact they are constantly moving. Interactions among electrons are also approximated to two electrons. <\/p>\n\n\n\n

Ag\u00eancia FAPESP \u2013 How does density functional theory (DFT) help surmount this problem?<\/strong><\/em>
Elson Longo<\/strong> \u2013<\/strong> In the early days of quantum mechanics, few systems could be resolved analytically or even by means of a numerically approximate solution. However, in 1927, British physicist Llewellyn Thomas (1903-1992) and Italian physicist Enrico Fermi (1901-1954) proposed a probabilistic model for the analysis of the electron density of atoms. Decades later, this idea led to DFT, developed by Kohn and Hohenberg. It enables us to compute complex systems such as crystals and facilitates interpretation of the results. Therefore, we can coherently interpret the properties of three-dimensional systems, two-dimensional surfaces, and even one-dimensional systems such as nanotubes and nanowires and compare them with experimental results.<\/p>\n\n\n\n

Ag\u00eancia FAPESP \u2013 Why is DFT a limited alternative?<\/strong><\/em>
Longo \u2013<\/strong> Not only is DFT an alternative that still has limitations, but also quantum mechanics in its entirety is constantly advancing thanks to the development of new alternatives and methodologies. This is made possible by the expansion of computer power, enabling, in this case, the calculation of more complex crystal systems, the development of more sophisticated algorithms, and the obtaining of a closer correlation between models and experimental results.<\/p>\n\n\n\n

Ag\u00eancia FAPESP \u2013 What new methods can obtain a more accurate representation of the materials of interest?<\/strong><\/em>
Sambrano \u2013<\/strong> Current advances in quantum mechanics are being driven by the better interpretation of theoretical data on the basis of experimental results. Knowledge of the energies of the various surfaces of a crystal is important to produce theoretical models of the morphologies of a crystal on the nanometric scale. These morphologies can be associated with the experimental results obtained using high-resolution electron microscopy, and the results can be associated with the properties of crystals.<\/p>\n\n\n\n

Ag\u00eancia FAPESP \u2013 What are the possible technological applications of a more accurate representation?<\/strong><\/em>
Longo \u2013<\/strong> The first step in developing any technology is knowledge creation. Here, by refining the theoretical models, we are able to achieve a better understanding of how properties change when the electron density is disturbed. Our knowledge of crystal systems increases, and we can propose new research to target a specific property, for example, improving the bactericidal power of a crystal and, at the same time, producing a better response to its photoluminescent properties.<\/p>\n\n\n\n

Ag\u00eancia FAPESP \u2013 Tell us about the computer program used in the study.<\/strong><\/em>
Longo \u2013<\/strong> The program was CRYSTAL17, developed by Professor Roberto Dovesi and his group at the University of Turin in Italy. This program runs DFT simulations of quantum mechanics calculations for periodic structures such as those of crystals and computes the related properties for these systems. Sambrano\u2019s research group at UNESP has ample experience with simulations applied to materials and with the program. Sambrano spent a long period in Turin with Dovesi and continues to work with the developers of the program. This partnership has already led to several publications on topics linked to CDMF\u2019s research projects supported by FAPESP.<\/p>\n\n\n\n

The article \u201cComputational procedure to an accurate DFT simulation to solid state systems\u201d can be retrieved from: www.sciencedirect.com\/science\/article\/abs\/pii\/S0927025619304756?via%3Dihub#!<\/strong><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

By Jos\u00e9 Tadeu Arantes  |  Ag\u00eancia FAPESP \u2013 Describing and explaining the electronic properties of certain crystalline materials that have a three-dimensionally ordered atomic structure can be complicated owing to the large number of atoms involved, each […]<\/a><\/p>\n<\/div>","protected":false},"author":3,"featured_media":205,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[11,9],"tags":[17,18,19],"class_list":{"0":"post-204","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-featured","8":"category-news","9":"tag-cdmf","10":"tag-cepid","11":"tag-fapesp"},"yoast_head":"\nStudy refines computer simulation of crystal solids - Functional Materials Development Center<\/title>\n<meta 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