Print Email Facebook Twitter Suppression of the Phase Coexistence of the fcc-fct Transition in Hafnium-Hydride Thin Films Title Suppression of the Phase Coexistence of the fcc-fct Transition in Hafnium-Hydride Thin Films Author Bannenberg, L.J. (TU Delft RID/TS/Instrumenten groep) Schreuders, H. (TU Delft ChemE/O&O groep) Kim, H.J. (National Institute of Advanced Industrial Science and Technology (AIST)) Sakaki, Kouji (National Institute of Advanced Industrial Science and Technology (AIST)) Hayashi, Shigenobu (National Institute of Advanced Industrial Science and Technology (AIST)) Ikeda, Kazutaka (The High Energy Accelerator Research Organization (KEK)) Otomo, Toshiya (National Institute of Advanced Industrial Science and Technology (AIST)) Dam, B. (TU Delft ChemE/Chemical Engineering) Asano, Kohta (National Institute of Advanced Industrial Science and Technology (AIST)) Department ChemE/Chemical Engineering Date 2021 Abstract Metal hydrides may play a paramount role in a future hydrogen economy. While most applications are based on nanostructured and confined materials, studies considering the structural response of these materials to hydrogen concentrate on bulk material. Here, using in situ in- and out-of-plane X-ray diffraction and reflectometry, we study the fcc ↔fct transition in Hf thin films, an optical hydrogen-sensing material. We show that the confinement of Hf affects this transition: compared to bulk Hf, the transition is pushed to a higher hydrogen-to-metal ratio, the tetragonality of the fct phase is reduced, and phase coexistence is suppressed. These nanoconfinement effects ensure the hysteresis- free response of hafnium to hydrogen, enabling its remarkable performance as a hydrogen-sensing material. In a wider perspective, the results highlight the profound influences of the nanostructuring and nanoconfinement of metal hydrides on their structural response to hydrogen with a significant impact on their applicability in future devices. To reference this document use: http://resolver.tudelft.nl/uuid:88746b84-33f8-4156-9b50-5acc9436be98 DOI https://doi.org/10.1021/acs.jpclett.1c03411 ISSN 1948-7185 Source The Journal of Physical Chemistry Letters, 12 (45), 10969-10974 Part of collection Institutional Repository Document type journal article Rights © 2021 L.J. Bannenberg, H. Schreuders, H.J. Kim, Kouji Sakaki, Shigenobu Hayashi, Kazutaka Ikeda, Toshiya Otomo, B. Dam, Kohta Asano Files PDF acs.jpclett.1c03411.pdf 2.24 MB Close viewer /islandora/object/uuid:88746b84-33f8-4156-9b50-5acc9436be98/datastream/OBJ/view