Structural and Kinetic Analysis of BaCl 2 Nanocrystals in Fluorochlorozirconate Glass-Ceramics
- Materials Science and Engineering Department, Northwestern University, 2220 Campus Dr Cook Hall Room 2036 Evanston Illinois 60208; Materials Science Division, Argonne National Laboratory, 9700 S Cass Ave, Bldg 241 Argonne Illinois 60439
- Mechanical, Aerospace and Biomedical Engineering Department, University of Tennessee Space Institute, 411 B. H. Goethert Pkwy Tullahoma Tennessee 37388
The presence of BaCl2 nanocrystals and the crystallographic phase that they adopt controls the optical behavior of fluorochlorozirconate glass-ceramics. We have used in situ X-ray diffraction heating experiments and ex situ transmission electron microscopy to follow the BaCl2 nanocrystal nucleation and growth processes as a function of heating rate and isothermal hold temperature. The BaCl2 nanocrystals nucleate with the hexagonal crystal structure and grow as spherical particles to a size of similar to 10 to 20nm. They then undergo a structural transformation to the orthorhombic phase and their shape changes to rounded disks, with diameters ranging from 150 to 250nm, and thicknesses ranging from 80 to 120nm. The change in size results from Ostwald ripening of the hexagonal BaCl2 nanocrystals to form the orthorhombic BaCl2 nanocrystals.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); Argonne National Laboratory; USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1356614
- Journal Information:
- Journal of the American Ceramic Society, Vol. 98, Issue 4; ISSN 0002-7820
- Publisher:
- American Ceramic Society
- Country of Publication:
- United States
- Language:
- English
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