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Title: Dehydration kinetics of nanoconfined water in beryl probed by high temperature single crystal synchrotron X-ray diffraction

Journal Article · · Scientific Reports
 [1];  [2];  [3];  [4];  [5]
  1. University of Hawaii at Manoa, Honolulu, HI (United States); University of Chicago, Argonne, IL (United States); OSTI
  2. University of Hawaii at Manoa, Honolulu, HI (United States); University of Chicago, Argonne, IL (United States)
  3. University of Hawaii at Manoa, Honolulu, HI (United States); University of Chicago, Argonne, IL (United States); Chinese Academy of Sciences, Guiyang (China)
  4. University of Arizona, Tucson, AZ (United States)
  5. University of Hawaii at Manoa, Honolulu, HI (United States)

Understanding changes in material properties through external stimuli plays a key role in validating the expected performance of materials and engineering material properties in a controlled manner. Here, we introduce a fundamental protocol to deduce dehydration reactions kinetics of water confined in nanopore channels, with the cyclosilicate beryl as the scaffold of interest, using time-resolved synchrotron X-ray diffraction (SXRD), in the temperature interval of 298–1038 K. The temperature-dependent intensity (I) of the strongest reflection (112) was used as the crystallite variable. An estimation of an isobaric thermal crystallite coefficient, k, analogous with the isobaric thermal expansion coefficient, established the rate of relative crystallization as a function of temperature, $$\frac{∂I}{∂T}$$. A plot of lnk and $$\frac{1}{T}$$ gives rise to two kinetic steps, indicating a slow dehydration stage up to ~ 700 K and a fast dehydration stage up to the investigated temperature 1038 K. The crystal structure of beryl determined up to 1038 K, in temperature increment as small as 10 K, indicates the presence of channel ions Na and Fe and a gradual decrease of water upon heating.

Research Organization:
University of Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-94ER14466
OSTI ID:
2472235
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 14; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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