EXAFS and SAXS studies of ZrCo alloy doped with Hf, Sc and Ti atoms

Qi, Yingxia; Ju, Xin; Wan, Chubin; Qiu, Jie; Xin, Yong; Wang, Shumao; Liu, Xiaopeng; Jiang, Lijun

doi:10.1016/j.ijhydene.2009.05.045

Cited by 36 publications

(8 citation statements)

References 20 publications

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“…In view of the variation of lattice parameter, it is easy to understand the kinetic performances of Zr 0.8 Ti 0.2 Co after ball milling. When the lattice parameter and cell volume become smaller, the occupancy of H atom in interstitial sites will become more difficult but release of H atom from interstitial sites will be easier [ 41 ]. Hence, it is observed that hydrogen absorption kinetics decreases but hydrogen desorption kinetics increases for Zr 0.8 Ti 0.2 Co with increasing ball milling time.…”

Section: Resultsmentioning

confidence: 99%

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Kou

Luo

et al. 2018

Scanning

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The effects of ball milling on the hydrogen sorption kinetics and microstructure of Zr0.8Ti0.2Co have been systematically studied. Kinetic measurements show that the hydrogenation rate and amount of Zr0.8Ti0.2Co decrease with increasing the ball milling time. However, the dehydrogenation rate accelerates as the ball milling time increases. Meanwhile, the disproportionation of Zr0.8Ti0.2Co speeds up after ball milling and the disproportionation kinetics is clearly inclined to be linear with time at 500°C. It is found from X-ray powder diffraction (XRD) results that the lattice parameter of Zr0.8Ti0.2Co gradually decreases from 3.164 Å to 3.153 Å when the ball milling time extends from 0 h to 8 h, which is mainly responsible for the hydrogen absorption/desorption behaviors. In addition, scanning electron microscope (SEM) images demonstrate that the morphology of Zr0.8Ti0.2Co has obviously changed after ball milling, which is closely related to the hydrogen absorption kinetics. Besides, high-resolution transmission electron microscopy (HRTEM) images show that a large number of disordered microstructures including amorphous regions and defects exist after ball milling, which also play an important role in hydrogen sorption performances. This work will provide some insights into the principles of how to further improve the hydrogen sorption kinetics and disproportionation property of Zr0.8Ti0.2Co.

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Section: Resultsmentioning

confidence: 99%

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Kou

Luo

et al. 2018

Scanning

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“…To date, many experiments have shown that samples with smaller lattice parameters and cell volume have the expected anti-disproportionation ability. Nevertheless, it is only the appearance that describes the anti-disproportionation performance, and it is not the determinant of a stronger anti-disproportionation performance caused by element substitution [ 105 , 106 , 107 ]. For instance, when the Ni element substitutes for the Co element, the doped sample has a better cyclic stability and anti-disproportionation performance, but the lattice parameters and cell volume increase with Ni substitution.…”

Section: Discussionmentioning

confidence: 99%

Research Progress on the Anti-Disproportionation of the ZrCo Alloy by Element Substitution

Wang

et al. 2020

Materials

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Hydrogen-induced disproportionation (HID) during the cycles of absorption and desorption leads to a serious decline in the storage capacity of the ZrCo alloy, which has been recognized as the biggest obstacle to its application. Therefore, the prerequisite of a ZrCo application is to solve its anti-disproportionation problem in the field of rapid hydrogen isotope storage. Beyond surface modification and nanoball milling, this work systematically reviews the method of element substitution, which can obviously improve the anti-disproportionation. From a micro angle, as hydrogen atoms that occupy the 8e site in the ZrCoH3 lattice are instable and are considered to be the driving force of disproportionation, researchers believe that element substitution by changing the occupation of hydrogen atoms at the 8e site can improve the anti-disproportionation of the alloy. At present, Ti/Nb substitutions for the Zr terminal among substitute elements have an excellent anti-disproportionation performance. In this work, up-to-date research studies on anti-disproportionation and its disproportionation mechanism of the ZrCo alloy are introduced by combining experiments and simulations. Moreover, the optimization of the alloy based on the occupation mechanism of 8e sites is expected to improve the anti-disproportionation of the ZrCo alloy.

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“…Here, we report the synthesis and physical properties of the compound ScZrCo with a non-centrosymmetric structure. This compound was slightly mentioned before in the way that by doping Sc into ZrCo alloy, however the structure and physical properties have never been determined [23]. We find that ScZrCo does not crystalize in the tetragonal CuAl 2 structure like Zr 2 Co, but in the cubic Ti 2 Ni structure with the space group Fd3mS [24].…”

Section: Introductionmentioning

confidence: 94%

Pressure induced superconductivity in the compound ScZrCo

Wang

Zhu

et al. 2018

New J. Phys.

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We report on the synthesis and physical properties of a new compound, ScZrCo, which crystallizes in the Ti 2 Ni structure with the space group of Fd3mS without a spatial inversion center. The resistivity at ambient pressure shows a semiconducting-like behavior. Furthermore, specific heat and magnetic susceptibility measurements yield a rather large value of Wilson ratio ≈4.47. Both suggest a ground state with correlation effect. By applying pressure, the up-going behavior of resistivity in the low temperature region is suppressed and superconductivity emerges. Up to 36.1 GPa, a superconducting transition at about 3.6 K with a quite high upper critical field is observed. Our discovery here provides a new platform for investigating the relationship between the correlation effect and superconductivity.

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EXAFS and SAXS studies of ZrCo alloy doped with Hf, Sc and Ti atoms

Cited by 36 publications

References 20 publications

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Research Progress on the Anti-Disproportionation of the ZrCo Alloy by Element Substitution

Pressure induced superconductivity in the compound ScZrCo

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EXAFS and SAXS studies of ZrCo alloy doped with Hf, Sc and Ti atoms

Cited by 36 publications

References 20 publications

Structural and Kinetic Hydrogen Sorption Properties of Zr0.8Ti0.2Co Alloy Prepared by Ball Milling

Structural and Kinetic Hydrogen Sorption Properties of Zr0.8Ti0.2Co Alloy Prepared by Ball Milling

Research Progress on the Anti-Disproportionation of the ZrCo Alloy by Element Substitution

Pressure induced superconductivity in the compound ScZrCo

Contact Info

Product

Resources

About

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling

Structural and Kinetic Hydrogen Sorption Properties of Zr_0.8Ti_0.2Co Alloy Prepared by Ball Milling