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Title: Guiding Synthesis of Polymorphs of Materials Using Nanometric Phase Diagrams

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.8b11029· OSTI ID:1483244
 [1];  [2];  [2];  [3];  [4];  [3];  [2];  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Univ. of Maryland, College Park, MD (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)

Conventionally, phase diagrams serve as road maps for the design and synthesis of materials. However, bulk phase diagrams are often not as predictive for the synthesis of nanometric materials, mainly due to the increased significance of surface energy. The change of surface energy can drastically alter the total energy of the nanocrystals and thus yields a polymorph or metastable phase different from the stable phase in bulk, providing a means for controlling the synthesis of metastable phases. To achieve a theoretical and systematical understanding on the polymorphism of nanomaterials, metallic cobalt was chosen as a model system, where the two polymorphs, fcc and hcp phases, can be tuned with 100% selectivity in a solvothermal reaction. Advanced in situ synchrotron X-ray diffraction (XRD) technique and density functional theory (DFT) calculationswere complementarily employed to reveal the size- and surface-dependent polymorphism at nanometer scale. The nanometric phase diagram provides a general predictive approach to guide the synthesis of metastable materials.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; AC02-06CH11357
OSTI ID:
1483244
Alternate ID(s):
OSTI ID: 1489779
Report Number(s):
BNL-209475-2018-JAAM
Journal Information:
Journal of the American Chemical Society, Vol. 140, Issue 49; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (1)

Toward materials-by-design: achieving functional materials with physical and chemical effects journal October 2019