The MAterials Simulation Toolkit for Defect and Diffusion Calculations
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1 The MAterials Simulation Toolkit for Defect and Diffusion Calculations Tam Mayeshiba, Henry Wu, Zhewen Song, Ben Afflerbach, Professor Dane Morgan University of Wisconsin-Madison NIST/CHiMaD Data Workshop, Evanston, IL May 2,
2 MAST s role in the Materials Genome Initiative Computational Tools Solid oxide fuel cell server, bloomenergy.com Experimental Tools Digital Data Materials Innovation Infrastructure TRISO fuel particle, US DOE Reactor pressure vessel, US DOE MGI image retouched from 2
3 What is MAST? MAterials Simulation Toolkit A" B" C" D" Motivated by materials science: defects and diffusion Created for simulations (materials calculations) E" " D = Aexp Q % $ ' # kt & Workflow manager and post-processor 3
4 Outline: Advantages of MAST Automatically manage workflows MAST workflow management overview Setting up a simple defect and diffusion workflow Actual diffusion workflow schematic Modify a workflow at any time Manage workflows on various clusters Iterate easily over calculation system features Store and share workflow knowledge (VASP, diffusion, defects) Produce highly organized, consistently calculated data Dilute solute diffusion Scale examples of MAST-generated data Storing MAST-generated data 4
5 MAST workflow management overview Crontab or user command Jobs on queue Workflow directories with input files and metadata Evaluate workflow logic New jobs to queue Finished workflows to archive 5
6 Setting up a simple defect and diffusion workflow Directed Acyclic Graph (DAG) structure B A C perfect_a MAST locates and creates defects D How the DAG appears in the MAST input file: perfect_a defect_b defect_c defect_b, defect_c transition_d defect_b defect_c MAST pairs up defects and sets up the path transition_d 6
7 Actual diffusion workflow schematic 32 steps (not all steps are shown) Managing one case by hand is time-consuming and error prone Managing many workflows for many host-solute combinations by hand would be even worse => use MAST instead 7
8 Modify a workflow at any time Missed a step? Add branches to workflows mid-completion and rerun Example: Forgot the solute hop! Add a new branch with a defect calculation and a path calculation. A B C E D F 8
9 Manage workflows on various clusters External cluster External cluster PBS/Torque External cluster Local cluster Low headnode load Process-independent job monitor Does not require a continuous process Monitor gets information from text files: stable Rebuilt each time: can be interrupted or fail without severe consequences Install and run without root access 9
10 Iterate easily over calculation system features 1.8# 1.6# 1.4# Migra&on)barrier)(eV)) 1.2# 1.0# 0.8# 0.6# 0.4# 0.2# Sc# Ti# V# Cr# Mn# Fe# Co# Ni# Ga# Migration barrier (ev) cross body cross face in line no dopants 0.0# )2# )1# 0# 1# 2# Biaxial)strain)(%)) Percent biaxial strain Same perovskite oxygen migration barrier workflow applied to different chemical systems, strain states, and dopant positions Mayeshiba, T. & Morgan, D. PCCP 17, 2715 (2015). 10
11 Store and share workflow knowledge Extensive out-of-the-box functionality Full diffusion coefficient workflow Phonons Multiple hops Frequency models for diffusion Full defect formation energy workflow Charged defects Finite size scaling Potential alignment Save custom workflows for future use Input file saved with data Reproduce results Formation*energy*(eV) V As$ Ga As$ 2.2 Bi Ga$ As Ga$ Bi As$ V Ga$ E F * *E VBM *(ev) 11
12 Diffusion Barrier [ev] Diffusion Barrier [ev] Produce highly-organized, consistently-calculated data Example: Dilute solute diffusion Sc Y La Sc Y La Ti V Zr Nb Hf Ta Ti V Zr Nb Hf Ta Cr Mn Fe MoTc Ru W Re Os Cr Mn Fe MoTc Ru W Re Os Co Rh Ir Co Rh Ir Ni Pd Pt Ni Pd Pt Cu Ag Au Cu Ag Au Zn Ga Cd In Hg Tl Zn Ga Cd In Hg Tl Ge Sn Pb Al Ge Sn Pb Ni 7 hosts (5 FCC, 1 HCP, 1 BCC) > 230 host-solute combinations As Sb Bi As Sb Bi ω 3 ω 0 ω 0 ω 3 ω ω 4 1 ω ω 3 2 ω 1 Theory Diffusion Coefficient [cm 2 / s] Ni Experiment Diffusion Coefficient [cm 2 / s] Ag Al Au Co Cr Cu Fe Ge In Pt S Sb Sn V diffusiondata.materialshub.org; H. Wu et al., Scientific Data (2016, accepted). 12
13 Scale examples of MAST-generated data Diffusion Barrier [ev] Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Y Zr Nb MoTc Ru Rh Pd Ag Cd In Sn Sb La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Al Solute diffusion 1 : steps per workflow x 230+ host-solute systems => over 6000 calculations Perovskite oxygen migration, with and without strain 2,3 : steps per workflow x 200+ workflows and 392 steps per workflow x 4 systems => over 5000 calculations Surface exchange coefficient descriptor in perovskites 4 : 3 steps per workflow x compositions => over 5500 calculations MAST is good for handling complex workflows and for copying workflows over many systems. [1] H. Wu et al., Scientific Data (2016, accepted) [2] T. Mayeshiba & D. Morgan, PCCP 17, 2715 (2015) [3] T. Mayeshiba & D. Morgan, in preparation [4] R. Jacobs et al., in preparation 13
14 Storing MAST-generated data Workflow management of calculations Archived data NIST Data repository Figshare hare v2 Zenodo Materials Data Facility/Globus? Data acquisition and processing 3-30 steps per workflow workflows per data set Interactive data Data repository calculations per data set, 5-30 GB Own dilute solute diffusion database websitehttp://diffusiondata.materials hub.org Materials Project dataset: MPContribs (in progress) Citrine/Citrination? Consolidation strategies? 14
15 Summary MAST was built to: Automatically manage workflows Iterate easily over calculation system features Composition, strain, defects Store and share workflow knowledge Included workflows emphasize diffusion and defect calculations Almost all VASP calculations can be automated using MAST Produce highly organized, consistently calculated data B A D C ω 3 ω 3 ω 1 ω ω 3 2 ω 1 a) FCC five-frequency Diffusion Barrier [ev] Sc Y La Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Zr Nb MoTc Ru Rh Pd Ag Cd In Sn Sb Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Al Github repository: Documentation: Python Package Index: 15
16 Acknowledgements COMPUTATIONAL MATERIALS GROUP Faculty * Izabela Szlufarska * Dane Morgan Postdocs * Georgios Bokas * Guangfu Luo * Henry Wu * Jia-Hong Ke * Mahmood Mamivand * Ryan Jacobs * Shipeng Shu * Wei Xie * Yueh-Lin Lee Graduate Students * Amy Kaczmarowski * Ao Li * Austin Way * Benjamin Afflerbach * Chaiyapat Tangpatjaroen * Cheng Liu * Franklin Hobbs * Hao Jiang * Huibin Ke * Hyunseok Ko * Jie Feng * Lei Zhao * Mehrdad Arjmand * Shenzhen Xu * Shuxiang Zhou * Tam Mayeshiba * Xing Wang * Yipeng Cao * Zhewen Song Visiting and Undergraduate Students * Aren Lorenson * Benjamin Anderson * Haotian Wu * Jason Maldonis * Josh Perry * Jui-Shen Chang * Liam Witteman * Tom Vandenberg * Zachary Jensen T. Mayeshiba: NSF GRFP DGE , UW-Madison GERS H. Wu, Z. Song, B. Afflerbach: NSF SI2-SSI Calculations: UW-Madison Center for High Throughput Computing; University of Kentucky Lipscomb Center; NERSC DE-AC02-05CH
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