Isomorphic phase transition in solid <i>n</i>-H2
G. N. ShcherbakovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. I. ProkhvatilovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovI. N. KrupskiĩPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
X-ray studies of normal hydrogen at T = 13.6 K reveal a phase transformation with a negative volume jump ΔV = 0.16 cm3/mole, occurring without a change in the hexagonal symmetry of the lattice. It is established that the volume jump is accompanied by an appreciable jump in the ratio of the lattice parameters c/a, which for the high-temperature phase corresponds to close packing of spheres. It is shown that the introduction of krypton impurities into the hydrogen stabilizes the fcc structure near the melting temperature of n-H2.
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