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The structure of the recently identified metastable ice XVII, obtained byrelease of hydrogen from the C$_0$ D$_2$O-H$_2$ compound (filled ice), has beenaccurately measured by neutron powder diffraction. The diffraction pattern isindexed with a hexagonal cell and can be refined with space group $P6_122$ soto obtain accurate values of the oxygen and deuterium positions. The values ofthe lattice constants at three temperatures between 25 to 100 K are reported,and their behavior is compared with that of ice Ih. Ice XVII is a porous solidthat, if exposed to H$_2$ gas, may adsorb a substantial amount of it.Monitoring this effect at a constant temperature of 50 K, we have observed thatthe two lattice constants show opposite behavior, $a$ increases and $c$decreases, with the volume showing a linear increase. At temperatures higherthan 130 K the metastability of this form of porous ice is lost and the sampletransforms into ice Ih.

Refined Structure of Metastable Ice XVII from Neutron Diffraction Measurements