Neutron Diffraction Study of Ice Polymorphs under Helium Pressure

Autor:	R. G. Wenzel, A. L. Bowman, S. W. Rabideau, N. G. Nereson, G. P. Arnold
Rok vydání:	1971
Předmět:	Ice III Atmospheric pressure Neutron diffraction Analytical chemistry Ice II General Physics and Astronomy chemistry.chemical_element Crystal structure Crystallography Tetragonal crystal system chemistry Ice IX Physical and Theoretical Chemistry Helium
Zdroj:	The Journal of Chemical Physics. 55:589-595
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1675791
Popis:	Neutron diffraction studies of several of the D2O ice polymorphs were made with helium pressures to 3.5 kbar. Volume compressions (ΔV / V) were obtained for ices Ih, Ic, and IX at 2.1 to 2.8 kbar. The equilibrium phase boundaries between ices I–II and I–III in the presence of helium are shifted toward higher pressure values. The crystal structures of ices Ih, Ic, II, and IX at approximately 2.5 kbar are the same as the structures found for these ice forms at atmospheric pressure. A tetragonal structure is indicated for ice III with lattice parameters at − 23°C and 2.7 kbar of a = 6.674 ± 0.015 A and c = 6.97 ± 0.03 A. The c / a ratio for ice IX has been found to be 1.000 ± 0.003 both at 1 bar and at 2.8 kbar.
Databáze:	OpenAIRE
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