Hydrogen storage properties of (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1M0.1 (M=Ni, Fe, Cu) alloys easily activated at room temperature

The(Ti_(0.85)Zr_(0.15))_(1.05)Mn_(1.2)Cr_(0.6)V_(0.1)M_(0.1)(M=Ni, Fe, Cu) alloys with a single C14-type Laves phase have been fabricated by arc melting. They are able to be easily activated by one hydrogen absorption and desorption cycle under 4 MPa hydrogen pressure and vacuum at room temperature. Partial substitution of M for Mn results in the increase of hydrogenation and dehydrogenation capacities in an order of Ni Fe Cu. M elements increase the absorption and desorption plateau pressure in an order of(Ti_(0.85)Zr_(0.15))_(1.05)Mn_(1.2)Cr_(0.6)V_(0.1)Cu_(0.1)(Ti_(0.85)Zr_(0.15))_(1.05)Mn_(1.2)Cr_(0.6)V_(0.1)Fe_(0.1)(Ti_(0.85)Zr_(0.15))_(1.05)Mn_(1.2)Cr_(0.6)V_(0.1)Ni_(0.1). The(Ti_(0.85)Zr_(0.15))_(1.05)Mn_(1.2)Cr_(0.6)V_(0.1)Cu_(0.1) alloy has reversible hydrogen capacities of 1.81 wt% at 273 K and 1.58 wt% at 318 K with formation enthalpy(ΔH_(ab)) of-20.66 kJ mol~(-1) and decomposition enthalpy(ΔH_(de)) of 27.37 kJ mol~(-1). The differences in the hydrogen storage properties can be attributed to the increase of the interstitial size for hydrogen accommodation caused by the increase of unit cell volumes in the order of(Ti_(0.85)Zr_(0.15))_(1.05)Mn_(1.2)Cr_(0.6)V_(0.1)Ni_(0.1)(Ti_(0.85)Zr_(0.15))_(1.05)Mn_(1.2)Cr_(0.6)V_(0.1)Fe_(0.1)(Ti_(0.85)Zr_(0.15))_(1.05)Mn_(1.2)Cr_(0.6)V_(0.1)Cu_(0.1).     

Properties of PbLa（Zr,Sn, Ti）O3 ceramics near ferroelectric-antiferroelectric phase boundary

Shirane found in the middle of the 20th century that the solid solution PZT had a lot of fine characteristics and carried out detailed researches[1]. The critical phase transition field of antiferroelectric decreased by adding titanate. Titanate expands t…