TY - JOUR
T1 - Annealing effects on hydrogen ordering in KOD-doped ice observed using neutron diffraction
AU - Arakawa, Masashi
AU - Kagi, Hiroyuki
AU - Fukazawa, Hiroshi
N1 - Funding Information:
This study was supported by Grants-in-Aid for JSPS Fellows (20-3621), for Creative Scientific Research (19S0205), and for Young Scientists (18740342) from the Japan Society for Promotion of Science, and the Global COE Programs for Chemistry Innovation and for Deep Earth Mineralogy.
PY - 2010/5/19
Y1 - 2010/5/19
N2 - We measured the neutron powder diffraction of 0.013 M KOD-doped D2O ice to investigate the formation process of ice XI, a hydrogen-ordered phase of ice Ih. The doped ice Ih transformed to ice XI after annealing at 57 and subsequently at 68 K. The mass fraction of ice XI to that of the doped ice (f) was estimated using Rietveld analysis for each sample. The f value of the doped ice, which had once experienced being ice XI (f = 0.23), was larger than that of the doped ice, which had never experienced being ice XI (f = 0.14). Results indicate that small hydrogen-ordered domains remained in the ice Ih, which had once transformed to ice XI, and accelerated the phase transition from ice Ih to ice XI. Results further suggest that large amounts of ice on icy bodies in our solar system can transform to ice XI, which might be detectable using infrared telescopes or planetary exploration in the near future.
AB - We measured the neutron powder diffraction of 0.013 M KOD-doped D2O ice to investigate the formation process of ice XI, a hydrogen-ordered phase of ice Ih. The doped ice Ih transformed to ice XI after annealing at 57 and subsequently at 68 K. The mass fraction of ice XI to that of the doped ice (f) was estimated using Rietveld analysis for each sample. The f value of the doped ice, which had once experienced being ice XI (f = 0.23), was larger than that of the doped ice, which had never experienced being ice XI (f = 0.14). Results indicate that small hydrogen-ordered domains remained in the ice Ih, which had once transformed to ice XI, and accelerated the phase transition from ice Ih to ice XI. Results further suggest that large amounts of ice on icy bodies in our solar system can transform to ice XI, which might be detectable using infrared telescopes or planetary exploration in the near future.
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U2 - 10.1016/j.molstruc.2010.02.016
DO - 10.1016/j.molstruc.2010.02.016
M3 - Article
AN - SCOPUS:77952105337
SN - 0022-2860
VL - 972
SP - 111
EP - 114
JO - Journal of Molecular Structure
JF - Journal of Molecular Structure
IS - 1-3
ER -