Download or read book First Principles Prediction of Structures and Properties in Crystals written by Dominik Kurzydlowsk and published by MDPI. This book was released on 2019-10-25 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The term “first-principles calculations” is a synonym for the numerical determination of the electronic structure of atoms, molecules, clusters, or materials from ‘first principles’, i.e., without any approximations to the underlying quantum-mechanical equations. Although numerous approximate approaches have been developed for small molecular systems since the late 1920s, it was not until the advent of the density functional theory (DFT) in the 1960s that accurate “first-principles” calculations could be conducted for crystalline materials. The rapid development of this method over the past two decades allowed it to evolve from an explanatory to a truly predictive tool. Yet, challenges remain: complex chemical compositions, variable external conditions (such as pressure), defects, or properties that rely on collective excitations—all represent computational and/or methodological bottlenecks. This Special Issue comprises a collection of papers that use DFT to tackle some of these challenges and thus highlight what can (and cannot yet) be achieved using first-principles calculations of crystals.

Download or read book First Principles Prediction of Structures and Properties in Crystals written by Dominik Kurzydlowski and published by . This book was released on 2019 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The term "first-principles calculations" is a synonym for the numerical determination of the electronic structure of atoms, molecules, clusters, or materials from 'first principles', i.e., without any approximations to the underlying quantum-mechanical equations. Although numerous approximate approaches have been developed for small molecular systems since the late 1920s, it was not until the advent of the density functional theory (DFT) in the 1960s that accurate "first-principles" calculations could be conducted for crystalline materials. The rapid development of this method over the past two decades allowed it to evolve from an explanatory to a truly predictive tool. Yet, challenges remain: complex chemical compositions, variable external conditions (such as pressure), defects, or properties that rely on collective excitations-all represent computational and/or methodological bottlenecks. This Special Issue comprises a collection of papers that use DFT to tackle some of these challenges and thus highlight what can (and cannot yet) be achieved using first-principles calculations of crystals.

Download or read book Methods and Applications of Crystal Structure Prediction written by Royal Society of Chemistry and published by Faraday Discussions. This book was released on 2018 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers key researchers representing the full scientific scope of the crystal structure prediction.

Download or read book Predictions of Crystal Structures from First Principles written by and published by . This book was released on 2007 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recently developed method denoted as SAPT(DFT), which applies symmetry-adapted perturbation theory (SAPT) based on Kohn-Sham orbitals and orbital energies and includes the dispersion component obtained using frequency-dependent density susceptibilities from density functional theory (DFT), has been shown to provide as accurate interaction energies as high-level wave function-based methods. At the same time, the former calculations can be performed at a greatly reduced computational cost compared to the latter, in fact, in a time comparable to supermolecular DFT calculations. The SAPT(DFT) method is particularly important for systems with a dominant dispersion component since the supermolecular DFT approach fails completely in this case. SAPT(DFT) was used to compute the interaction potential for the RDX dimer. This potential was applied to predictions of the properties of the RDX crystal in molecular dynamics simulations. The fully ab initio calculated properties are in excellent agreement with experiment and the predictions are even slightly better than achieved by empirical potentials fitted to the crystal experimental data.

Download or read book Pharmaceutical Salts and Co crystals written by Johan Wouters and published by Royal Society of Chemistry. This book was released on 2011-11-04 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: From crystal structure prediction to totally empirical screening, the quest for new crystal forms has become one of the most challenging issues in the solid state science and particularly in the pharmaceutical world. In this context, multi-component crystalline materials like co-crystals have received renewed interest as they offer the prospect of optimized physical properties. As illustrated in this first book_ entirely dedicated to this emerging class of pharmaceutical compounds_ the outcome of such endeavours into crystal engineering have demonstrated clear impacts on production, marketing and intellectual property protection of active pharmaceutical ingredients (APIs). Indeed, co-crystallization influences relevant physico-chemical parameters (such as solubility, dissolution rate, chemical stability, melting point, hygroscopicity, à) and often offers solids with properties superior to those of the free drug. Combining both reports of the latest research and comprehensive overviews of basic principles, with contributions from selected experts in both academia and industry, this unique book is an essential reference, ideal for pharmaceutical development scientists and graduate students in pharmaceutical science.

Download or read book Data Mining and Intermetallic Property Prediction written by David J. Fisher and published by Materials Research Forum LLC. This book was released on 2022-08-05 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a computer-aided data mining approach and available experimental data bases, the author discusses the prediction of the structures and properties of intermetallic alloy compounds. The book references 252 original resources with their direct web links for in-depth reading. Keywords: Data-Mining, Intermetallic Compounds, Structure-Mapping, Clustering Methods, Free Energy, Energy Landscapes of Compounds, Stable Groupings of Atoms, Intermetallic Phases, Crystal Unit Cell Size, Platonic Solids, Symmetries, Stoichiometries, Stability Fields.

Download or read book LBL Research Review written by and published by . This book was released on 1985 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Prediction and Calculation of Crystal Structures written by Sule Atahan-Evrenk and published by Springer. This book was released on 2014-05-06 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Current Chemistry presents critical reviews of the present and future trends in modern chemical research. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field. Review articles for the individual volumes are invited by the volume editors. Readership: research chemists at universities or in industry, graduate students.

Download or read book Modern Methods of Crystal Structure Prediction written by Artem R. Oganov and published by John Wiley & Sons. This book was released on 2011-08-04 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gathering leading specialists in the field of structure prediction, this book provides a unique view of this complex and rapidly developing field, reflecting the numerous viewpoints of the different authors. A summary of the major achievements over the last few years and of the challenges still remaining makes this monograph very timely.

Download or read book High Pressure Crystallography written by Elena Boldyreva and published by Springer Science & Business Media. This book was released on 2010-08-20 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book is devoted to the theme of crystallographic studies at high pressure. It places emphasis on the phenomena characteristic to the compressed state of matter, as well as experimental and theoretical techniques, used to study these phenomena.

Download or read book Cheminformatics Developments written by Jan H. Noordik and published by IOS Press. This book was released on 2004 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: The developments in information technology in the last decades of the 20th century have fundamentally changed the way in which scientific information is being communicated and used. A scientific discipline where the impact of these changes has been particularly significant is (bio)chemistry. Up to less than 25 years ago, molecular modeling was a hardly-existent computational chemistry niche, only practiced at those few institutes that could afford the very expensive specialised hardware. Also rapid access to not only the primary literature but, possibly even more importantly, to the factual primary data about millions of chemical compounds, to reactions, structures, and spectra, and to the genomic data of various organisms including humans, can only be provided by digital storage and retrieval techniques. This book seeks to document some key developments in computerized chemical information in the last two decades of the past century. To put the developments into a historic perspective, the three opening chapters present review articles on the founding, the history, and the operation of three different representative European computer chemistry institutes.These introductory chapters are personal accounts of history and development and clearly show the different approaches and aims in setting up these (academic) research and/or service facilities for computer-aided chemistry and cheminformatics. The following chapters form a bridge to recent cheminformatics research by covering selected topics in the fields of organic synthesis, drug design, crystallography, modeling and chemistry teaching.

Download or read book Machine Learning in 2D Materials Science written by Parvathi Chundi and published by CRC Press. This book was released on 2023-11-13 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data science and machine learning (ML) methods are increasingly being used to transform the way research is being conducted in materials science to enable new discoveries and design new materials. For any materials science researcher or student, it may be daunting to figure out if ML techniques are useful for them or, if so, which ones are applicable in their individual contexts, and how to study the effectiveness of these methods systematically. KEY FEATURES • Provides broad coverage of data science and ML fundamentals to materials science researchers so that they can confidently leverage these techniques in their research projects. • Offers introductory material in topics such as ML, data integration, and 2D materials. • Provides in-depth coverage of current ML methods for validating 2D materials using both experimental and simulation data, researching and discovering new 2D materials, and enhancing ML methods with physical properties of materials. • Discusses customized ML methods for 2D materials data and applications and high-throughput data acquisition. • Describes several case studies illustrating how ML approaches are currently leading innovations in the discovery, development, manufacturing, and deployment of 2D materials needed for strengthening industrial products. • Gives future trends in ML for 2D materials, explainable AI, and dealing with extremely large and small, diverse datasets. Aimed at materials science researchers, this book allows readers to quickly, yet thoroughly, learn the ML and AI concepts needed to ascertain the applicability of ML methods in their research.

Download or read book Bibliography written by Pierre Villars and published by Walter de Gruyter. This book was released on 2012-12-21 with total page 1827 pages. Available in PDF, EPUB and Kindle. Book excerpt: By browsing about 10 000 000 scientific articles of over 200 major journals mainly in a 'cover to cover approach' some 200 000 publications were selected. The extracted data is part of the following fundamental material research fields: crystal structures (S), phase diagrams (also called constitution) (C) and the comprehensive field of intrinsic physical properties (P). This work has been done systematically starting with the literature going back to 1900. The above mentioned research field codes (S, C, P) as well as the chemical systems investigated in each publication were included in the present work. The aim of the Inorganic Substances Bibliography is to provide researchers with a comprehensive compilation of all up to now published scientific publications on inorganic systems in only three handy volumes.

Download or read book Crystal structure prediction using neural network potential and age fitness Pareto genetic algorithm written by Sadman Sadeed Omee and published by OAE Publishing Inc.. This book was released on 2024-03-02 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: While crystal structure prediction (CSP) remains a longstanding challenge, we introduce ParetoCSP, a novel algorithm for CSP, which combines a multi-objective genetic algorithm (GA) with a neural network inter-atomic potential model to find energetically optimal crystal structures given chemical compositions. We enhance the updated multi-objective GA (NSGA-III) by incorporating the genotypic age as an independent optimization criterion and employ the M3GNet universal inter-atomic potential to guide the GA search. Compared to GN-OA, a state-of-the-art neural potential-based CSP algorithm, ParetoCSP demonstrated significantly better predictive capabilities, outperforming by a factor of 2.562 across 55 diverse benchmark structures, as evaluated by seven performance metrics. Trajectory analysis of the traversed structures of all algorithms shows that ParetoCSP generated more valid structures than other algorithms, which helped guide the GA to search more effectively for the optimal structures. Our implementation code is available at https://github.com/sadmanomee/ParetoCSP.

Download or read book Theoretical Modeling of Organohalide Perovskites for Photovoltaic Applications written by Giacomo Giorgi and published by CRC Press. This book was released on 2017-07-12 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perovskites are a class of recently discovered crystals with a multitude of innovative applications. In particular, a lead role is played by organic-inorganic halide perovskites (OIHPs) in solar devices. In 2013 Science and Nature selected perovskite solar cells as one of the biggest scientific breakthroughs of that year. This book provides the first comprehensive account of theoretical aspects of perovskite solar cells, starting at an introductory level but covering the latest cutting-edge research. Theoretical Modeling of Organohalide Perovskites for Photovoltaic Applications aims to provide a theoretical standpoint on OIHPs and on their photovoltaic applications, with particular focus on the issues that are still limiting their usage in solar cells. This book explores the role that organic cations and defects play in the material properties of OIHPs and their effects on the final device, in addition to discussing the electric properties of OIHPs; the environmentally friendly alternatives to the use of lead in their structural and electronic properties; theoretical screening for OIHP-related material for solar-to-energy conversion; and the nature and the behavior of quasiparticles in OIHPs.

Download or read book Machine learning accelerated first principles predictions of the stability and mechanical properties of L12 strengthened cobalt based superalloys written by Shengkun Xi and published by OAE Publishing Inc.. This book was released on 2022-09-20 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: As promising next-generation candidates for applications in aero-engines, L12-strengthened cobalt (Co)-based superalloys have attracted extensive attention. However, the L12 strengthening phase in first-generation Co-Al-W-based superalloys is metastable, and both its solvus temperature and mechanical properties still need improvement. Therefore, it is necessary to discover new L12-strengthened Co-based superalloy systems with a stable L12 phase by exploring the effect of alloying elements on their stability. Traditional first-principles calculations are capable of providing the crystal structure and mechanical properties of the L12 phase doped by transition metals but suffer from low efficiency and relatively high computational costs. The present study combines machine learning (ML) with first-principles calculations to accelerate crystal structure and mechanical property predictions, with the latter providing both the training and validation datasets. Three ML models are established and trained to predict the occupancy of alloying elements in the supercell and the stability and mechanical properties of the L12 phase. The ML predictions are evaluated using first-principles calculations and the accompanying data are used to further refine the ML models. Our ML-accelerated first-principles calculation approach offers more efficient predictions of the crystal structure and mechanical properties for Co-V-Ta- and Co-Al-V-based systems than the traditional counterpart. This approach is applicable to expediting crystal structure and mechanical property calculations and thus the design and discovery of other advanced materials beyond Co-based superalloys.

Download or read book Intermetallics written by Walter Steurer and published by Oxford University Press. This book was released on 2016-09-09 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fascinating world of intermetallics is largely unexplored. There are many exciting physical properties and important technological applications of intermetallics, from magnetism to superconductivity. The main focus of this book is on the statistics, topology and geometry of crystal structures and structure types of intermetallic phases. The underlying physics, in particular chemical bonding, is discussed whenever it helps understand the stability of structures and the origin of their physical properties. The authors' approach, based on the statistical analysis of more than twenty thousand intermetallic compounds in the data base Pearson's Crystal Data, uncovers important structural relationships and illustrates the relative simplicity of most of the general structural building principles. It also shows that a large variety of actual structures can be related to a rather small number of aristotypes. The text aims to be readable and beneficial in one way or another to everyone interested in intermetallic phases, from graduate students to experts in solid state chemistry and physics, and materials science. For that purpose it avoids the use of enigmatic abstract terminology for the classification of structures. Instead, it focuses on the statistical analysis of crystal structures and structure types in order to draw together a larger overview of intermetallics, and indicate the gaps in it - areas still to be explored, and potential sources of worthwhile research. The text should be read as a reference guide to the incredibly rich world of intermetallic phases.