Prepare the System for Measuring Pressure-Concentration-Isotherms of Metal Alloys Hydrogen and Apply the system to Measure Hydrogenation Characteristics of LaNi_(4.5)Co_(0.5)(2)

摘要

The Sieverts-type apparatus was made to measure pressure-concentration-isotherm (PCT) diagrams of metal hydrogen systems. The apparatus equipped with a horizontal sample container, was improved to minimize the dead space. A leak rate of the Hydrogen of the apparatus was 4.83 X 10~(-4) Pa centre dot dm~3s~(-1). When PCT diagrams of LaN_(4.5)Co_(0.5)-hydrogen systems were measured using this apparatus, the reproducibility of the diagram was invariably good. The enthalpy(#DELTA#H) and entropy(#DELTA#S) changes determined for LaNi_(4.5)Co_(0.5)H_6 were -32.7kJmol (H_2)~(-1) and 113Jmol(H_2)~(-1), respectively.