A medium-range structure motif linking amorphous and crystalline states
- Nanjing Univ. of Technology (China); City Univ. of Hong Kong (China)
- Nanjing Univ. of Aeronautics and Astronautics (China)
- City Univ. of Hong Kong, Dongguan (China)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Nanjing Univ. of Technology (China)
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Nanjing Univ. of Aeronautics and Astronautics, Nanjing (China)
- City Univ. of Hong Kong (China)
- Southern University of Science and Technology, Shenzhen, Guangdong (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- City Univ. of Hong Kong (China); City Univ. of Hong Kong, Shenzhen (China)
Amorphous materials have no long-range order, but there are ordered structures at short range (2–5 Å), medium range (5–20 Å) and even longer length scales. While regular and semiregular polyhedra are often found as short-range ordering in amorphous materials, the nature of medium-range order has remained elusive. Consequently, it is difficult to determine whether there exists any structural link at medium range or longer length scales between the amorphous material and its crystalline counterparts. Moreover, an amorphous material often crystallizes into a phase of different composition, with very different underlying structural building blocks, further compounding the issue. Here, we capture an intermediate crystalline cubic phase in a Pd-Ni-P amorphous alloy and reveal the structure of the medium-range order, a six-membered tricapped trigonal prism cluster (6M-TTP) with a length scale of 12.5 Å. We find that the 6M-TTP can pack periodically to several tens of nanometres to form the cube phase. Our experimental observations provide evidence of a structural link between the amorphous and crystalline phases in a Pd-Ni-P alloy at the medium-range length scale and suggest that it is the connectivity of the 6M-TTP clusters that distinguishes the crystalline and amorphous phases. These findings will shed light on the structure of amorphous materials at extended length scales beyond that of short-range order.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC); National Natural Science Foundation of Jiangsu Province; Fundamental Research Funds for the Central Universities; Australian Nuclear Science and Technology Organization
- Grant/Contract Number:
- AC02-06CH11357; 51871120; 51571170; 51520105001; BK20200019; 2019B121205003; JLFS/P-102/18
- OSTI ID:
- 1827410
- Journal Information:
- Nature Materials, Vol. 20, Issue 10; ISSN 1476-1122
- Publisher:
- Springer Nature - Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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