Giant-thermal-expansion martensitic alloys for ultrahigh-efficiency solid-state heat-pumping

Giant-thermal-expansion martensitic alloys for ultrahigh-efficiency solid-state heat-pumping | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Giant-thermal-expansion martensitic alloys for ultrahigh-efficiency solid-state heat-pumping Qiao Li, Zhongzheng Deng, Aslan Ahadi, Kangjie Chu, Jie Yan, Kai Huang, and 4 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4856090/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 15 May, 2025 Read the published version in Nature Communications → Version 1 posted You are reading this latest preprint version Abstract Heating with less energy consumption and environmental impacts is a major challenge confronting the world. Solid-state heat-pumping using phase-transitional materials offer a promising green solution, but these materials′ coefficient of performance (COPmat) is only about 4 ~ 23, imposing an intrinsic restriction on the energy efficiency of developed devices. Here, we propose ultrahigh-efficiency heat-pumping via the reversible heat produced by anhysteretic linear elastic deformation of martensitic alloys. We discover that many of these alloys exhibit a large adiabatic temperature change (∆T_ad) when stressed along the crystallographic directions of intrinsic giant linear thermal expansion. Material-level heat-pumping through such thermoelastic effect is demonstrated using preferentially [100]-oriented Ti78Nb22 martensitic polycrystals, achieving a giant COPmat of 87 and a cyclically stable ∆T_ad of 5 K at 473 K. Our work opens a non-phase-transitional route towards energy-efficient solid-state heat-pumping. Physical sciences/Materials science/Materials for energy and catalysis Physical sciences/Physics/Applied physics Full Text Additional Declarations There is NO Competing Interest. Cite Share Download PDF Status: Published Journal Publication published 15 May, 2025 Read the published version in Nature Communications → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4856090","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":361744339,"identity":"5fa7ccf3-72dc-4882-9041-ad50beb0133c","order_by":0,"name":"Qiao Li","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAs0lEQVRIiWNgGAWjYJCCAwwMFnIgBjOISawWCWOQBuK1AIFEYgPRWnTbmzce+FEhkb7h/PkDzAVniNBiduZYwcGeMxK5G24kMzDPuEGMlhs5Bgd420BagA7j+UCMlvtvDA7+bZNINzh/mFgtN3gMDgNtSTA4AHQYD1EOO5NWcFjmjIThzBvJBod5iPL+8cObP76psJHnO3/w4WOeY0RoAQIDOOsAcRqQtYyCUTAKRsEowAoAyak7d/56AOwAAAAASUVORK5CYII=","orcid":"","institution":"The Hong Kong University of Science and Technology","correspondingAuthor":true,"prefix":"","firstName":"Qiao","middleName":"","lastName":"Li","suffix":""},{"id":361744340,"identity":"fd7e0a98-0649-4f17-a228-8e8323806350","order_by":1,"name":"Zhongzheng Deng","email":"","orcid":"","institution":"The Hong Kong University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Zhongzheng","middleName":"","lastName":"Deng","suffix":""},{"id":361744341,"identity":"67da744c-ae58-49aa-9e87-54cb3ce2847a","order_by":2,"name":"Aslan Ahadi","email":"","orcid":"","institution":"Ruhr University Bochum","correspondingAuthor":false,"prefix":"","firstName":"Aslan","middleName":"","lastName":"Ahadi","suffix":""},{"id":361744342,"identity":"583ec9a2-582a-4205-a38b-1e154b94da37","order_by":3,"name":"Kangjie Chu","email":"","orcid":"","institution":"Southern University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Kangjie","middleName":"","lastName":"Chu","suffix":""},{"id":361744343,"identity":"d588da21-dce7-4944-8a5c-22f7a9f3ab01","order_by":4,"name":"Jie Yan","email":"","orcid":"","institution":"City University of Hong Kong","correspondingAuthor":false,"prefix":"","firstName":"Jie","middleName":"","lastName":"Yan","suffix":""},{"id":361744344,"identity":"a475e481-c782-4619-9dc5-e4be93f6de93","order_by":5,"name":"Kai Huang","email":"","orcid":"","institution":"Wuhan University","correspondingAuthor":false,"prefix":"","firstName":"Kai","middleName":"","lastName":"Huang","suffix":""},{"id":361744345,"identity":"133ee377-4ee1-4531-ab6a-76584b036d2a","order_by":6,"name":"Sixia Hu","email":"","orcid":"","institution":"Southern University of Science and Technology","correspondingAuthor":false,"prefix":"","firstName":"Sixia","middleName":"","lastName":"Hu","suffix":""},{"id":361744346,"identity":"5c1f2899-054c-4704-973e-17646860839c","order_by":7,"name":"Yang Ren","email":"","orcid":"https://orcid.org/0000-0001-9831-6035","institution":"City University of HongKong","correspondingAuthor":false,"prefix":"","firstName":"Yang","middleName":"","lastName":"Ren","suffix":""},{"id":361744347,"identity":"7b7cf9f4-5a95-40e3-ab4f-c1d77cc6c1e2","order_by":8,"name":"B.B. 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