Hydrogenation characteristics of Ti4Cu2O

Alloy samples with a single phase structure of Ti 4 Cu 2 O were prepared and their hydrogenation characteristics were investigated. Pressure–composition isotherms of hydrogen absorption and desorption at 273, 303 and 313 K for the oxometallic alloys were measured over the range of hydrogen pressure from 0.004 to 2 MPa. The Ti 4 Cu 2 O alloys absorbed hydrogen up to 0.47 in the atomic ratio of hydrogen to metal at 273 K and under 2 MPa and reversibly desorbed at 313 K more than half of hydrogen absorbed. No distinct pressure plateau was observed in the isotherms. For all the samples after hydrogenation at temperatures and pressures below 523 K and 3 MPa, no phase other than Ti 4 Cu 2 O was observed in the X-ray diffraction profiles. The thermodynamic properties for the hydrogenation of the alloys were discussed.