[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-128217-en":3,"doc-seo-128217-105":31,"detail-sidebar-cat-0-en-105":92},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":21,"is_downloadable":21,"audit_status":21,"page_count":22,"language":23,"language_code":24,"site_id":25,"html_lang":24,"table_of_contents":26,"faqs":27,"seo_title":28,"seo_description":14,"update_tm":29,"read_time":30},128217,2336475104362,"Eden","https://ap-avatar.wpscdn.com/avatar/22000c4c46a41b752dd?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786595829695023868",8,"Research & Report","Application of Machine Learning Towards Discovering Magnetic Borides - Dissertation Abstract","Permanent magnetic materials underpin modern technologies including electric vehicles, wind turbines, medical devices, and data storage by retaining magnetization without an external field. Current permanent magnets depend heavily on rare-earth elements, creating supply-chain and environmental challenges. This dissertation uses machine learning with inorganic materials databases to enable rapid screening across large chemical spaces for rare-earth-free permanent magnet candidates. Machine learning is applied to transition metal borides as promising rare-earth-free magnet systems, with model training, interpretation, and domain-linked feature analysis, followed by XGBoost screening of 74,295 Ti3Co5B2-structure borides.","UC Riverside  \nUC Riverside Electronic Theses and Dissertations  \nTitle  \nApplication of Machine Learning Towards Discovering Magnetic Borides  \nPermalink  \n[https://escholarship.org/uc/item/0m58d8sj](https://escholarship.org/uc/item/0m58d8sj)  \nISBN  \n9798288854132  \nAuthor  \nYapo, Johan Achy  \nPublication Date  \n2024-12-02  \nCopyright Information  \nThis work is made available under the terms of a Creative Commons Attribution License, available at [https://creativecommons.org/licenses/by/4.0/](https://creativecommons.org/licenses/by/4.0/)  \nPeer reviewed  \n[eScholarship.org](eScholarship.org) Powered by the California Digital Library  \nUniversity of California  \nUNIVERSITY OF CALIFORNIA  \nRIVERSIDE  \nApplication of Machine Learning Towards Discovering Magnetic Borides  \nA Dissertation submitted in partial satisfaction  \nof the requirements for the degree of  \nDoctor of Philosophy  \nin  \nChemistry  \nby  \nJohan Achy Yapo  \nJune 2025  \nDissertation Committee:  \nDr. Boniface B. T. Fokwa, Chairperson  \nDr. Timothy Su  \nDr. Hill Harman  \nCopyright by Johan Achy Yapo 2025  \nThe Dissertation of Johan Achy Yapo is approved:  \n\n|  |\n| --- |\n|  |\n\nCommittee Chairperson  \nUniversity of California, Riverside  \nAcknowledgement  \nI acknowledge the San Diego Supercomputer Center (SDSC) for providing computing resources and the financial support by NSF (NSF 21-576) and UCR department of Chemistry for making this work possible. I acknowledge the help of Dr. Eunsoo Lee with all the experimental electrocatalytic measurements and with assistance in running the magnetic measurements. I would like to thank all co-authors for their contributions on the manuscripts listed below:  \nRezaie, A. A.; Lee, E.; Yapo, J. A.; Fokwa, B. P. T. Highly Active and Abundant MAB Phases Nin+1ZnBn (n=1, 2) toward Hydrogen Evolution. Adv Energy Sustain Res 2021, 2100052. [https://doi.org/10.1002/aesr.202100052](https://doi.org/10.1002/aesr.202100052) .  \nRezaie, A. A.; Lee, E.; Luong, D.; Yapo, J. A.; Fokwa, B. P. T. Abundant Active Sites on the Basal Plane and Edges of Layered van Der Waals Fe3GeTe2 for Highly Efficient Hydrogen Evolution. ACS Materials Lett. 2021, 313–319.  \n[https://doi.org/10.1021/acsmaterialslett.1c00048](https://doi.org/10.1021/acsmaterialslett.1c00048) .  \nLee, E.; Rezaie, A. A.; Luong, D.; Yapo, J. A.; Fokwa, B. P. T. Fe 5Ge 2Te 2 : Iron‐rich Layered Chalcogenide for Highly Efficient Hydrogen Evolution. Z. Anorg. Allg. Chem. 2022, 648 (15). [https://doi.org/10.1002/zaac.202200066](https://doi.org/10.1002/zaac.202200066) .  \nI want to begin by thanking everyone who has helped me along this journey. First and foremost, my deepest appreciation goes to my supervisor, Professor Boniface Fokwa for his marvelous guidance, encouragement, and support. He has always given me great advice especially whenever I was stuck or needed to see things from a new perspective, I have learned a lot about conducting research. Thank you very much for your constructive criticism and kind, supportive guidance during my Ph.D., Professor Fokwa.  \nThank you for my PhD. committee members, Dr. Timothy Su and Dr. Hill Harman for taking the time to consider this work. I am certain that their diverse thoughtsand feedback will improve this dissertation, and I really appreciate it.  \nNext, I would like to express my thanks to my friends and colleagues, Sang Bum Kim, Shola Adeniji, Dr. Kate Gibson, Dr. Diana Luong, Dr. Eunsoo Lee, Dr. Amir Rezaie, Dr. Jan Scheifers, and Dr. Yuemei Zhang for fostering a collaborative, energetic, and supportive environment to perform research in. In particular, I am grateful for Dr. Eunsoo Lee and Sang Bum Kim for allowing me to support his electrocatalysis work, Dr. Yuemei Zhang for always being willing to help me with any questions about the computational methods used, and Andrew Krikorian the talented undergraduate researcher helping me refine and implement our machine learning work.  \nLast, but not least, my deepest thanks for family and close f","cbCaicwzxLbVNl5j","https://ap.wps.com/l/cbCaicwzxLbVNl5j","pdf",4039894,2,1,131,"English","en",105,"# Abstract of the Dissertation\n## Motivation and problem statement\n## Machine learning approach for screening\n## Chapter-level methodology and evaluation\n## XGBoost screening of transition metal borides","[{\"question\":\"Why are rare-earth-free permanent magnets important in this research?\",\"answer\":\"Rare-earth-based permanent magnets face supply-chain issues and environmental concerns. The dissertation targets rare-earth-free alternatives to support sustainable technologies.\"},{\"question\":\"What materials class does the dissertation focus on?\",\"answer\":\"The research focuses on transition metal borides (TMBs) as a promising class for rare-earth-free permanent magnets.\"},{\"question\":\"How are machine learning models used to identify candidate magnetic borides?\",\"answer\":\"The study trains four models on a curated dataset, interprets the models to connect features with domain knowledge, and evaluates generalizability. It then applies the trained XGBoost model to screen 74,295 TMBs in the Ti3Co5B2 structure-type for novel candidates.\"}]","Application of Machine Learning Towards Discovering Magnetic Borides - Dissertation Abstract | PDF",1785945743,330,{"code":4,"msg":32,"data":33},"ok",{"site_id":25,"language":24,"slug":34,"title":13,"keywords":35,"description":14,"schema_data":36,"social_meta":87,"head_meta":89,"extra_data":91,"updated_unix":29},"application-of-machine-learning-towards-discovering-magnetic-borides-dissertation-abstract","",{"@graph":37,"@context":86},[38,54,69],{"@type":39,"itemListElement":40},"BreadcrumbList",[41,45,48,51],{"item":42,"name":43,"@type":44,"position":21},"https://docshare.wps.com","Home","ListItem",{"item":46,"name":47,"@type":44,"position":20},"https://docshare.wps.com/document/","Document",{"item":49,"name":12,"@type":44,"position":50},"https://docshare.wps.com/document/research-report/",3,{"item":52,"name":13,"@type":44,"position":53},"https://docshare.wps.com/document/application-of-machine-learning-towards-discovering-magnetic-borides-dissertation-abstract/128217/",4,{"url":52,"name":13,"@type":55,"author":56,"headline":13,"publisher":58,"fileFormat":61,"inLanguage":24,"description":14,"dateModified":62,"datePublished":63,"encodingFormat":61,"isAccessibleForFree":64,"interactionStatistic":65},"DigitalDocument",{"name":9,"@type":57},"Person",{"url":42,"name":59,"@type":60},"DocShare","Organization","application/pdf","2026-08-27","2026-08-05",true,{"@type":66,"interactionType":67,"userInteractionCount":20},"InteractionCounter",{"@type":68},"ViewAction",{"@type":70,"mainEntity":71},"FAQPage",[72,78,82],{"name":73,"@type":74,"acceptedAnswer":75},"Why are rare-earth-free permanent magnets important in this research?","Question",{"text":76,"@type":77},"Rare-earth-based permanent magnets face supply-chain issues and environmental concerns. 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It then applies the trained XGBoost model to screen 74,295 TMBs in the Ti3Co5B2 structure-type for novel candidates.","https://schema.org",{"og:url":52,"og:type":88,"og:title":13,"og:site_name":59,"og:description":14},"article",{"robots":90,"canonical":52},"index,follow",{"doc_id":7,"site_id":25},{"code":4,"msg":5,"data":93},[94,98,102,106,111,116,121,124,129,132,136],{"id":21,"doc_module":4,"doc_module_name":47,"category_name":95,"show_sort_weight":96,"slug":97},"Story & Novel",90,"story-novel",{"id":20,"doc_module":4,"doc_module_name":47,"category_name":99,"show_sort_weight":100,"slug":101},"Literature",80,"literature",{"id":53,"doc_module":4,"doc_module_name":47,"category_name":103,"show_sort_weight":104,"slug":105},"Exam",70,"exam",{"id":107,"doc_module":4,"doc_module_name":47,"category_name":108,"show_sort_weight":109,"slug":110},5,"Comic",60,"comic",{"id":112,"doc_module":4,"doc_module_name":47,"category_name":113,"show_sort_weight":114,"slug":115},6,"Technology",50,"technology",{"id":117,"doc_module":4,"doc_module_name":47,"category_name":118,"show_sort_weight":119,"slug":120},7,"Healthcare",40,"healthcare",{"id":11,"doc_module":4,"doc_module_name":47,"category_name":12,"show_sort_weight":122,"slug":123},30,"research-report",{"id":125,"doc_module":4,"doc_module_name":47,"category_name":126,"show_sort_weight":127,"slug":128},9,"Religion & Spirituality",20,"religion-spirituality",{"id":127,"doc_module":4,"doc_module_name":47,"category_name":130,"show_sort_weight":127,"slug":131},"World Cup","world-cup",{"id":133,"doc_module":4,"doc_module_name":47,"category_name":134,"show_sort_weight":133,"slug":135},10,"Lifestyle","lifestyle",{"id":137,"doc_module":4,"doc_module_name":47,"category_name":138,"show_sort_weight":107,"slug":139},19,"General","general"]