Hydrogen absorbing properties of a Ti-Zr-Mn eutectic alloy

 

Chem. Met. Alloys 1 (2008) 133-136

 

V. IVANCHENKO, T. PRYADKO, V. DEKHTYARENKO, T. KOSORUKOVA

 

Hydrogen storage properties of Ti-Zr-Mn eutectic alloys with the formula Ti0.475Zr0.3Mn0.225 were evaluated at ambient temperature and 565 °C using a Sieverts-type device. The initial alloys were studied by means of SEM-EDS technique, X-ray diffraction and DTA. The phase compositions and the crystal structures of the hydrogenation products were determined. The hydrogenation product obtained at room temperature consisted of an e-hydride with a tetragonal crystal structure of ThH2 type (a = 0.455 nm,= 0.469 nm) and a Laves phase-based hydride with MgZn2-type crystal structure (= 0.5587±0.0005 nm, = 0.9135±0.0007 nm) and had the composition 0.634(Ti0.64Zr0.29Mn0.066)H1.96 + 0.366(Ti0.18Zr0.32Mn0.5)H1.3. The phase composition of the hydrogenation products obtained at 565 ۜ°C was estimated to 0.55(Ti0.71Zr0.285Mn0.005)H1.85 + 0.45(Ti0.19Zr0.32Mn0.5)H1.35 and consisted of a d-hydride with a cubic crystal structure of CaF2 type (a = 0.4597 nm) and a Laves phase-based hydride with MgZn2-type crystal structure (= 0.5598±0.0006 nm,= 0.9192±0.0008 nm).

 

Microstructure of the 47.5Ti-30Zr-22.5Mn (at.%) eutectic alloy (electron back scattering image).

 

Keywords

Laves phase / Ternary alloy system / Crystal structure / Hydrogen storage