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Guzman, David M.

Publications and source records attributed to Guzman, David M..

Online simulation powered learning modules for materials science

Simulation tools are playing a significant role in materials science and engineering and beyond their well established importance in research and development, these tools have a vital pedagogical potential. We describe a set of online simulation tools and learning modules designed to help students explore important concepts in materials science where hands-on activities with high-fidelity simulations can provide insight not easily acquired otherwise. The online tools, which involve density functional theory and molecular dynamics simulations, have been designed with non-expert end-users in mind and only a few clicks are required to perform most simulations, yet they are powered by research-grade codes and expert users can access advanced options. All tools and modules are available for online simulation in nanoHUB.org and access is open and free of charge. Importantly, instructors and students do not need to download or install any software. The learning modules cover a range of topics from electronic structure of crystals and doping, plastic deformation in metals, and physical properties of polymers. These modules have been utilized in several core undergraduate courses at Purdue’s School of Materials Engineering, they are self contained, and are easy to incorporate into existing classes.

36 MATERIALS SCIENCE↗

BaZrSe 3 : Ab initio study of anion substitution for bandgap tuning in a chalcogenide material

Recently, transition metal perovskite chalcogenide materials have been introduced as possible candidates for solar cell applications. Here, we provide accurate theoretical calculations for BaZrS 3 and two phases of SrZrS 3 , which have been recently synthesized and their optical properties elaborated. In this study, we consider the substitution of S in BaZrS 3 with Se to form BaZrSe 3 . Evolutionary methods are used to find the optimal structure of this compound, and accurate calculations of its optoelectronic properties are presented. Using phonon frequency calculations and ab initio molecular dynamics, we assess the stability of this compound. We find that BaZrSe 3 is likely to be stable under typical conditions, with a low bandgap and high optical absorption coefficients. This indicates that BaZrSe 3 could be useful for solar cell applications.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗