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Report No.

Neutron diffraction and IR absorption studies of ice crystal; An Implication of planetary science

Arakawa, Masashi*; Kagi, Hiroyuki; Fernandez-Baca, J. A.*; Chakoumakos, B.*; Fukazawa, Hiroshi

The existence of ferroelectric ice XI with ordered hydrogen in the universe becomes of interest in astronomy and physical chemistry because of the strong electric force. However, the influence seemed to be limited because it forms at narrow temperature range. From neutron diffraction experiments, we found that small hydrogen-ordered domains with ferroelectricity exist at higher temperature and the domains induce the growth of bulk ice XI. The small ordered domain is named memory of hydrogen ordered ice because it is the residual structure of ice XI.



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