Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.70: Poster
Montag, 27. März 2006, 14:00–17:45, P1
Effect of H2 and D2 impurities on the structure and properties of solid Ne. Phase diagram of binary system Ne-nD2 — •Nikolay Galtsov, Prokhvatilov Anatolii, and Strzhemechny Mikhail — Verkin Institute for Low Temperature Physics and Engineering of NAN Ukraine, 47 Lenin ave., Kharkov, 61103, Ukraine
Solid solutions of normal hydrogen and deuterium with neon, quench deposited from gas mixtures, were studied by powder x-ray diffraction for hydrogens contents from 2 to 70 mol.-% at temperatures from 5 K to melting temperatures. The structure of Ne-nH2 and Ne-nD2 condensates was investigation immediately after preparation. The boundary of homogeneous cubic hydrogen-in-neon solutions has been established to be about 2 mol-%, deuterium-in-neon - to be about 5 mol-%, under the specific sample preparation conditions. At higher nominal H2 (D2) concentrations, a hexagonal hcp2 phase in addition to the cubic fcc phase forms. The volumes of the elementary cells of both phases are close to that of pure neon. The phase hcp2 seems to be a perfect storage of hydrogen and deuterium: it can contain up to 85 mol.-% H2 and up to 60 mol-% D2. The hcp2 disappeared as the condensates were warmed up to the melting temperatures. The metastable hexagonal phase observed in neon-rich mixtures studied here is apparently identical in nature to that found previously in hydrogen-rich mixtures: both hexagonal phases have roughly the same lattice parameters. The phase boundaries have been established for the entire entration range and proposed a full of phase diagram Ne-nD2.