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Metastable hexagonal close-packed palladium hydride in liquid cell TEM

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Title
Metastable hexagonal close-packed palladium hydride in liquid cell TEM
Author(s)
Jaeyoung Hong; Jee-Hwan Bae,; Hyesung Jo; Hee-Young Park; Sehyun Lee; Sung Jun Hong; Hoje Chun; Min Kyung Cho; Juyoung Kim; Joodeok Kim; Yongju Son; Haneul Jin; Jin-Yoo Suh; Sung-Chul Kim; Ha-Kyung Roh; Kyu Hyoung Lee; Hyung-Seok Kim; Kyung Yoon Chung; Chang Won Yoon; Kiryeong Lee; Seo Hee Kim; Jae-Pyoung Ahn; Hionsuck Baik; Gyeung Ho Kim; Byungchan Han; Sungho Jin; Taeghwan Hyeon; Jungwon Park; Chang Yun Son; Yongsoo Yang; Young-Su Lee; Sung Jong Yoo; Dong Won Chun
Publication Date
2022-03
Journal
Nature, v.603, no.7902, pp.631 - 636
Publisher
NLM (Medline)
Abstract
Metastable phases-kinetically favoured structures-are ubiquitous in nature1,2. Rather than forming thermodynamically stable ground-state structures, crystals grown from high-energy precursors often initially adopt metastable structures depending on the initial conditions, such as temperature, pressure or crystal size1,3,4. As the crystals grow further, they typically undergo a series of transformations from metastable phases to lower-energy and ultimately energetically stable phases1,3,4. Metastable phases sometimes exhibit superior physicochemical properties and, hence, the discovery and synthesis of new metastable phases are promising avenues for innovations in materials science1,5. However, the search for metastable materials has mainly been heuristic, performed on the basis of experiences, intuition or even speculative predictions, namely 'rules of thumb'. This limitation necessitates the advent of a new paradigm to discover new metastable phases based on rational design. Such a design rule is embodied in the discovery of a metastable hexagonal close-packed (hcp) palladium hydride (PdHx) synthesized in a liquid cell transmission electron microscope. The metastable hcp structure is stabilized through a unique interplay between the precursor concentrations in the solution: a sufficient supply of hydrogen (H) favours the hcp structure on the subnanometre scale, and an insufficient supply of Pd inhibits further growth and subsequent transition towards the thermodynamically stable face-centred cubic structure. These findings provide thermodynamic insights into metastability engineering strategies that can be deployed to discover new metastable phases. © 2022. The Author(s), under exclusive licence to Springer Nature Limited.
URI
https://pr.ibs.re.kr/handle/8788114/11984
DOI
10.1038/s41586-021-04391-5
ISSN
0028-0836
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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