Synthesis of Quasicrystal Phases by Mechanical Alloying of Ti45+xZr38-XNi17 (-4≤ X ≤16) Powder Mixtures, and Their Hydrogen Storage Properties

2003 ◽  
Vol 805 ◽  
Author(s):  
Akito Takasaki ◽  
Naoki Imai ◽  
Kenneth F. Kelton
Keyword(s):  
Mechanical Alloying ◽  
Hydrogen Desorption ◽  
Lattice Parameter ◽  
Hydrogen Atoms ◽  
Powder Mixtures ◽  
Hydrogen Storage Properties ◽  
Crystal Phases ◽  
Powder Compacts ◽  
Storage Properties ◽  
Type Crystal

ABSTRACTMechanical alloying of Ti45+xZr38-xNi17 (-4 ≤ x ≤ 16) elemental powder mixtures leads to the formation the amorphous phase, but subsequent annealing at 833 K causes the formation of icosahedral (i) quasicrystal and the Ti2Ni-type crystal phases. The α-Ti phase is also produced in Ti-rich powders after annealing. Both the quasilattice constant of the i-phase and the lattice parameter of the Ti2Ni-type crystal phase decrease monotonically with increasing substituted amount of Ti because of the smaller radius of the Ti atom. The maximum hydrogen concentration in the i-phase in all powder compacts, after electrochemical hydrogenation in a KOH solution, is almost the same, about 63 at% ([H] / [M] ≈ 1.7). The onset temperature of hydrogen desorption is about 570 K (at a heating rate of 5 K/min) for all powders, but the temperature for the maximum hydrogen desorption rate increases with increasing Ti concentration in the powders, suggesting that some hydrogen atoms might be more strongly bound in the quasilattice where the original Zr sites become occupied by Ti atoms.

Hydrogen Storage Properties of LiNH2/MgH2 Complex Materials with Ti Catalyst by Mechanical Alloying

2014 ◽  
Vol 898 ◽  
pp. 93-97 ◽  
Author(s):  
Zhi Qiang Lan ◽  
Song Liu ◽  
Shu Bo Li ◽  
Wen Lou Wei ◽  
Jin Guo
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Hydrogen Desorption ◽  
Onset Temperature ◽  
Complex Materials ◽  
Mill Time ◽  
Hydrogen Storage Properties ◽  
Hydrogen Saturation ◽  
Saturation Absorption ◽  
Storage Properties

A LiNH2/MgH2 (1:1) complex was prepared by mechanical alloying and the effects of Ti and TiF3 on the characteristics of hydrogen storage were investigated. It was found that LiMgN and Li2NH phases exist as the main phases in the LiNH2/MgH2 (1:1) complex and that Mg (NH2)2 and NH4HF2 phases appear when TiF3 is added. The onset temperature of hydrogen desorption was reduced with increasing mill time, and the hydrogen saturation absorption temperature for the LiNH2/MgH2 complex decreased about 30°C with the addition of Ti and TiF3. Ti and TiF3 as catalysts are favorable for reducing the dehydrogenation temperature. The addition of TiF3 can also facilitate the increase of hydrogen desorption for the LiNH2/MgH2 (1:1) complex.

Ti/Zr-Based Quasicrystals - Formation, Structure And Hydrogen Storage Properties

1998 ◽  
Vol 553 ◽  
Author(s):  
K. F. Kelton
Keyword(s):  
Hydrogen Storage ◽  
Rapid Quenching ◽  
Practical Reasons ◽  
Hydrogen Atoms ◽  
Hydrogen Storage Properties ◽  
Low Temperature Annealing ◽  
Icosahedral Quasicrystals ◽  
Crystal Phases ◽  
Complex Crystal ◽  
Storage Properties

AbstractMost common in Al-3d transition metal(TM) alloys, icosahedral quasicrystals (i-phase) are also found frequently in Ti/Zr-TM alloys. The Ti-TM-Si-O quasicrystals are metastable, produced only by rapid quenching, and are extremely disordered. In contrast, Ti-Zr-Ni i-phases are well ordered and stable, produced by relatively low temperature annealing, nearly 300°C below the melting temperature. Important for both basic and practical reasons, Ti/Zr-based quasicrystals can absorb significant quantities of hydrogen, up to two hydrogen atoms for each metal atom. The formation and structures of these quasicrystals and closely related complex crystal phases are discussed. The hydrogenation properties of these quasicrystals are presented and shown to be competitive with materials in current use for hydrogen storage and battery applications. Results from recent studies using hydrogen as a probe of the local structure of the quasicrystal and crystal approximant are presented.

scholarly journals Hydrogen storage properties of lithium silicon alloy synthesized by mechanical alloying

2011 ◽  
Vol 196 (1) ◽  
pp. 504-507 ◽  
Author(s):  
Koichi Doi ◽  
Satoshi Hino ◽  
Hiroki Miyaoka ◽  
Takayuki Ichikawa ◽  
Yoshitsugu Kojima
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Hydrogen Storage Properties ◽  
Silicon Alloy ◽  
Storage Properties

Hydrogen storage properties of Ti 0.72 Zr 0.28 Mn 1.6 V 0.4 alloy prepared by mechanical alloying and copper boat induction melting

2014 ◽  
Vol 39 (24) ◽  
pp. 12784-12788 ◽  
Author(s):  
Mostafa Kazemipour ◽  
Hamidreza Salimijazi ◽  
Ali Saidi ◽  
Ahmad Saatchi ◽  
Abolfazl Aref arjmand
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Induction Melting ◽  
Hydrogen Storage Properties ◽  
Storage Properties

scholarly journals Microstructure and Hydrogen Storage Properties of the Multiphase Ti0.3V0.3Mn0.2Fe0.1Ni0.1 Alloy

Reactions ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 287-300
Author(s):  
Salma Sleiman ◽  
Maria Moussa ◽  
Jacques Huot
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Raw Materials ◽  
Cast Alloy ◽  
Hydrogen Storage Properties ◽  
Arc Melting ◽  
Bcc Structure ◽  
The One ◽  
Storage Properties

The hydrogen storage properties of a multi-component alloy of composition Ti0.3V0.3Mn0.2Fe0.1Ni0.1 were investigated. The alloy was synthesized by arc melting and mechanical alloying, resulting in different microstructures. It was found that the as-cast alloy is multiphase, with a main C14 Laves phase matrix along with a BCC phase and a small amount of Ti2Fe-type phase. The maximum hydrogen storage capacity of the alloy was 1.6 wt.%. We found that the air-exposed samples had the same capacity as the as-cast sample but with a longer incubation time. Synthesis by mechanical alloying for five hours resulted in an alloy with only BCC structure. The hydrogen capacity of the milled alloy was 1.2 wt.%, lower than the as-cast one. The effect of ball milling of the as-cast alloy was also studied. Ball milling for five hours produced a BCC structure similar to the one obtained by milling the raw materials for the same time.

Structural and enhanced hydrogen storage properties of the Li12Mg3Si3Al phase

2021 ◽  
Vol 77 (5) ◽  
pp. 227-234
Author(s):  
Volodymyr Pavlyuk ◽  
Wojciech Ciesielski ◽  
Damian Kulawik ◽  
Nazar Pavlyuk ◽  
Grygoriy Dmytriv
Keyword(s):  
Hydrogen Storage ◽  
Storage Capacity ◽  
Hydrogen Desorption ◽  
Hydrogen Storage Capacity ◽  
Coordination Polyhedra ◽  
Hydrogen Storage Properties ◽  
New Material ◽  
Family Based ◽  
Storage Characteristics ◽  
Storage Properties

The multicomponent alumosilicide Li12Mg3Si3Al (cubic, space group I\overline{4}3d, cI76) belongs to the structural family based on the Cu15Si4 type. The Li atoms are ordered and occupy the site with symmetry 1 and the Mg atoms occupy the site with \overline{4}.. symmetry. The Si/Al statistical mixture occupies the site with .3. symmetry. The coordination polyhedra around the Li atoms are 13-vertex distorted pseudo-Frank–Kasper polyhedra. The environments of the Mg and Si/Al atoms are icosahedral. The hydrogen storage characteristics of Li12Mg3Si3Al were investigated. The reversible hydrogen storage capacity of the title compound is excellent and the gravimetric storage capacity of this new material, corresponding to 9.1 wt% H2, is higher compared to Li12Mg3Si4 (8.8 wt%). The enthalpy of hydrogen desorption is 86 kJ mol−1 and is lower compared to known lithium-based hydrides.

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