The Pr1-La MgNi4-Co  alloys: Synthesis, structure and hydrogenation properties

Oprysk, Volodymyr; Verbovytskyy, Yu.; Shtender, Vitalii; Lyutyy, Pavlo; Zavaliy, I.Yu.

doi:10.1016/j.solidstatesciences.2018.08.009

Cited by 16 publications

(16 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similar results were obtained for Pr-and Pr 0.5 La 0.5 -containing alloys 23 . [20][21][22][23]29,30 .…”

Section: Hydrogen Absorption Properties Of the Tbmgni 4-x Co Xsupporting

confidence: 86%

“…Similar results were obtained for Pr-and Pr 0.5 La 0.5 -containing alloys 23 . [20][21][22][23]29,30 . PCT curves with two plateaus for the TbMgNi 4-x Co x compounds (x ≥…”

Section: Hydrogen Absorption Properties Of the Tbmgni 4-x Co Xsupporting

confidence: 86%

“…2) resemble those obtained for isostructural LaMgNi 4 31 and CeMgCo 4 19 compounds, where formation of the α-, β-, γ-hydrides have been also observed. For RMgNi 4-x Co x compounds [19][20][21][22][23]29,30 only one plateau has been observed. Moreover, for the (Nd,Pr) 1-y La y MgNi 4-x Co x alloys, La and Co substitution initiates an easiest way to observe the β → γ transformation at 10 bar H 2 22,23 .…”

Section: Hydrogen Absorption Properties Of the Tbmgni 4-x Co Xmentioning

confidence: 97%

See 2 more Smart Citations

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

et al. 2019

View full text Add to dashboard Cite

Series of cubicTbMgNi 4-x Сo x (x = 0-4) pseudo binary compounds have been synthesized either by solid state reaction or mechanical alloying with further annealing treatment. Their hydrogenation properties have been studied by Pressure-Composition-Temperature (PCT) measurements, showing the formation of α-, βand γ-hydrides. The Co for Ni substitution yields a lowering of the equilibrium pressure and an increase of hydrogen capacity. An improvement of the kinetic of hydrogen absorption was observed for increasing Co content. The β-TbMgNi 4-x Сo x H 4 (x = 0-3) hydrides show an orthorhombic distortion (Pmn2 1 space group) whereas β-TbMgСo 4 H 3.3 hydride crystallizes in a monoclinic structure (Pm space group) derived from the orthorhombic structure. Sensitivity of the formation of the β-TbMgСo 4 H 3.3 hydride to the temperature has been observed in PCT curves: it exists below 50 °C. γ-TbMgNi 4-x Сo x H y (x = 2-4, y > 5) hydrides preserve the parent cubic structure (F-43m space group) with an hydrogen induced volume expansion of 17.9-22.3 %. The deuterium for hydrogen substitution in TbMgNiCo 3 -(H,D) 2 system prevents fast desorption at room temperature and ambient pressure The positions of deuterium atoms in the γ-TbMgCo 4 D 6 deuteride were determined by neutron powder diffraction. Two types of interstitial sites were found occupied: 87 % of deuterium atoms (D1 site) are located inside Tb 2 MgCo 2 octahedra and the remaining 13 % (D2 site) are inside Co 4 tetrahedra. The increase of Co content allows to improve the thermodynamic stability of TbMgNi 4-x Сo x hydrides as demonstrated by the lowering of the desorption plateau pressure, the increase of the desorption temperature and of the enthalpy of formation versus Co content. This last experimental result is confirmed by first principles calculations where electronic structures of intermetallic compounds and their cubic TbMgNi 4x Сo x H 6 hydrides are compared for x = 0, 2 and 4.

show abstract

“…Similar results were obtained for Pr-and Pr 0.5 La 0.5 -containing alloys 23 . [20][21][22][23]29,30 .…”

Section: Hydrogen Absorption Properties Of the Tbmgni 4-x Co Xsupporting

confidence: 86%

“…Similar results were obtained for Pr-and Pr 0.5 La 0.5 -containing alloys 23 . [20][21][22][23]29,30 . PCT curves with two plateaus for the TbMgNi 4-x Co x compounds (x ≥…”

Section: Hydrogen Absorption Properties Of the Tbmgni 4-x Co Xsupporting

confidence: 86%

Section: Hydrogen Absorption Properties Of the Tbmgni 4-x Co Xmentioning

confidence: 97%

See 1 more Smart Citation

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Як відомо, легування є одним із методів поліпшення експлуатаційних характеристик [3]. Заміщення лантану та нікелю на інші елементи веде до зростання корозійної стійкості матеріалів, здатності сплавів оборотно поглинати більше водню, розрядної ємності електродних матеріалів тощо [4][5][6][7][8][9]. Для з'ясування впливу різних компонентів останнім часом інтенсивно досліджують окремі системи РЗМ-магнійперехідний метал та їхні сплави в широкому концентраційному інтервалі [10][11][12][13][14][15][16][17].…”

Section: вступunclassified

SYNTHESIS, STRUCTURE AND HYDROGEN SORPTION PROPERTIES OF THE SELECTED RMgM4 (R = Y, Ce; M = TRANSITION METAL) ALLOYS

Verbovytskyy¹,

Zavaliy²,

Lyutyy³

et al. 2021

Proc. Shevchenko Sci. Soc. Chem. Sci.

View full text Add to dashboard Cite

Co, Fe, Mn) alloys were synthesized by the sintering method and characterized by X-ray powder diffraction method. All phases belong to the SnMgCu 4 structural type (space group F-43m). Rare earth metal atoms occupy the position of Mg atoms (4a), Mg atoms are located in the Sn sites (4c), and transition metal atoms distribute the Cu positions (16e). Three selected alloys were hydrogenated. The alloys easily absorb hydrogen at room temperature and maximum pressure up to 10 bar. One orthorhombic YMgNi 3 FeH 4.2 (structural type NdMgNi 4 D 3.6 , spatial group Pmn2 1 ) and two cubic YMgNi 2 Fe 2 H 5.0 and YMgCo 2 Cu 2 H 3.8 (structural type LaMgNi 4 D 4.85 , spatial group F-43m) were synthesized. Volume expansion of the unit cell for saturated hydrides compared to their parent alloys is in the range 12-14%. In general, volume evolution is in good agreement with absorbed quantity of hydrogen.Electrode materials for the selected alloys were made and their main electrochemical characteristics (maximum discharge capacity and cyclic stability) were established. The nature of the transition metal is crucial in yttrium alloys. RMgM 4 alloys containing only Co, Fe, Cu are characterized by very low values of the discharge capacity, which does not exceed 50 mAh/h. YMgNi 4 -based alloys have elevated discharge capacity. Replacing nickel in the YMgNi 4 alloys by iron or manganese leads to some increase and then decrease discharge capacity. It is highest in the YMgNi 3 Mn (287 mAh/h) and YMgNi 3.5 Fe 0.5 (178 mAh/h) electrodes. When CeMgCo 4 is replaced by nickel the value of discharge capacity decreases. It is high only in alloys with the highest cobalt content: CeMgNiCo 3 (C max = 104 mAh/h).

show abstract

“…Among them the RMgNi4 phases are characterized by good solid gas and electrochemical properties and can be easily prepared by sintering or induction melting methods [6][7][8][9][10][11][12][13][14][15][16][17][18]. Recently, the YMgNi4-xCox [19], LaMgNi4-xCox [20], NdMgNi4-xCox [21], La1-xNdxMgNi4-yCoy [22] and Pr1-xLaxMgNi4-yCoy [23] alloy systems were systematically investigated in our research group. The gas hydrogenation of such alloys shown that the maximum capacity increases linearly with the Co content from 4 H/f.u.…”

Section: Introductionmentioning

confidence: 99%

Solid gas and electrochemical hydrogenation properties of the R1-xR’xMgNi4-yCoy (R, R’ = Y, La, Ce) alloys

Verbovytskyy

Zavaliy

Berezovets

et al. 2020

Phys. Chem. Solid St.

View full text Add to dashboard Cite

New R1-xR’xMgNi4-yCoy (R, R’ = Y, La, Ce; x = 0.5; y = 0, 1, 2) alloys have been synthesized by powder sintering method, and their crystal structure and hydrogen storage properties have been studied. X-ray diffraction analysis showed that R1-xR’xMgNi4-yCo alloys belong to the MgCu4Sn-type structure. The synthesized alloys absorb hydrogen at room temperature and hydrogen pressure 0.1-10 bar. For some of the studied compounds, the formation of hydrides with cubic and orthorhombic structures was found. Highest hydrogen content is found for the Co-rich compounds: La0.5Y0.5MgNi2Co2H5.18 and La0.5Ce0.5MgNi2Co2H6.48. Electrochemical studies showed that Y-based electrode materials exhibit better electrochemical performance comparing with Ce-doped ones. Highest discharge capacity of 292 mА∙h/g was observed for La0.5Y0.5MgNi3Co, but the best cyclic stability after 50th cycle of 92% was seen for La0.5Y0.5MgNi2Co2. Additionally, obtained results of the electrochemical properties were compared with related compounds. High rate dischargeability of Co-free alloys at I = 1 A/g were twice higher than ones containing cobalt.

show abstract

The Pr1-La MgNi4-Co alloys: Synthesis, structure and hydrogenation properties

Cited by 16 publications

References 23 publications

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

SYNTHESIS, STRUCTURE AND HYDROGEN SORPTION PROPERTIES OF THE SELECTED RMgM4 (R = Y, Ce; M = TRANSITION METAL) ALLOYS

Solid gas and electrochemical hydrogenation properties of the R1-xR’xMgNi4-yCoy (R, R’ = Y, La, Ce) alloys

Contact Info

Product

Resources

About

The Pr1-La MgNi4-Co alloys: Synthesis, structure and hydrogenation properties

Cited by 16 publications

References 23 publications

TbMgNi4-xCox–(H,D)2 System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

TbMgNi4-xCox–(H,D)2 System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

SYNTHESIS, STRUCTURE AND HYDROGEN SORPTION PROPERTIES OF THE SELECTED RMgM4 (R = Y, Ce; M = TRANSITION METAL) ALLOYS

Solid gas and electrochemical hydrogenation properties of the R1-xR’xMgNi4-yCoy (R, R’ = Y, La, Ce) alloys

Contact Info

Product

Resources

About

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures