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Abstract
Hydrogen dissociation pressures have been measured for the quasibinary systems Cao 0.5Ln 0.5H n , where Ln = Pr, Nd, Gd, Y and n ≈ 1.8–2.3, at 300–450 °C and 0.1–1.0 atm. Considerable hysteresis and nonequilibrium were found. X-ray crystal structure determinations were made at room temperature on certain quenched and annealed samples. The Pr system showed complete solid solution formation at the higher temperatures and some separation into two f.c.c. phases at room temperature; the Nd system showed extensive solutions at higher temperatures and large separation into two f.c.c. phases at room temperature. Increasing nonstoichiometry was found in the series Pr, Nd, Gd; hexagonal GdH 3 was not found. The Y system behaved as a mechanical mixture of CaH 2 and YH 2-YH 3. Analogies to the systems YbH 2-YbH 2.5 and to certain lanthanide difluoride systems are noted. Evidence is presented for a possible role of oxyhydride phases as an impurity in lanthanide hydrides.
Published Version
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