The incompressibility and thermal expansivity of D2O ice II determined by powder neutron diffraction

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Abstract

Using high-resolution neutron powder diffraction, the molar volume of a pure sample of D 2 O ice II has been measured, within its stability field, at 225 K, over the pressure range 0.25 < P < 0.45 GPa. Ar gas was used as the pressure medium, to avoid the formation of `stuffed ice' gas hydrates encountered when using He. The third-order Birch–Murnaghan equation of state parameters of helium-free D 2 O ice II, referenced to 225 K, are: V 0,225 = 306.95 ± 0.04 Å 3 (1299.7 ± 0.2 kg m −3 ), K 0,225 = 12.13 ± 0.07 GPa, with K'_{0,225} fixed at 6.0. The thermal expansivity of metastable D 2 O ice II samples recovered to ambient pressure has also been measured, over the range 4.2 < T < 160 K; above 160 K an irreversible transition to ice I c was observed. The volumetric expansion coefficient, α V , at P = 0 and T = 225 K, is predicted to be 2.48 × 10 −4 K −1 .

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APA

Fortes, A. D., Wood, I. G., Alfredsson, M., Vočadlo, L., & Knight, K. S. (2005). The incompressibility and thermal expansivity of D2O ice II determined by powder neutron diffraction. Journal of Applied Crystallography, 38(4), 612–618. https://doi.org/10.1107/S0021889805014226

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