Electrode Materials Based on LaMgNi4–x Co x (0 ≤ x ≤ 1) Alloys

Verbovytskyy, Yu.; Shtender, Vitalii; Lyutyi, P. Ya.; Zavaliy, I.Yu.

doi:10.1007/s11106-017-9839-y

Cited by 14 publications

(8 citation statements)

References 23 publications

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“…The paramagnetic state of the TbMgNi 4 compound agrees with a band structure calculation 5 and with the results for other RMgNi 4 compounds. 10,11 The Curie temperature (T C ), determined as the minimum of the M(T) first derivative, slowly grows versus Co concentration up to x = 2. A sharper increase is observed for x > 2, which can be fitted by a log(T) = f(x) linear variation (log(T) = 0.88 + 0.46x), indicating a strengthening of the magnetic interactions versus Co content (Figure 1b).…”

Section: Magnetic Properties Of Tbmgni 4−x Comentioning

confidence: 99%

“…Also, lowering the Mg content decreases the equilibrium pressure. , The studies of the electrochemical properties of such R 1– y Mg y Ni 4– x Co x compounds did not demonstrate such an outstanding improvement of the hydrogen capacity versus the Co content. Only a small amount of Co ( x = 0.5 for La 1– y R y MgNi 4– x Co x (R = Pr or Nd, y = 0 or 0.5); , x = 1 for La 1– y R y MgNi 4– x Co x (R = Y or Ce, y = 0 or 0.5); x = 0.33 for LaMgNi 4– x Co x ) slightly increases the discharge capacity while further increasing the Co content leads to the deterioration of the electrochemical properties. Additionally, Pr or Nd for La substitution improves the cyclic stability of the corresponding electrodes. , On the other hand, electrode materials with a larger Mg content ( y = 1.2) are characterized by improved electrochemical capacity due to both weight lowering and enhanced solid–gas H capacity …”

Section: Introductionmentioning

confidence: 99%

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TbMgNi_4–xCo_x–(H,D)₂ System. II: Correlation between Structural and Magnetic Properties

et al. 2023

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The magnetic properties of TbMgNi 4−x Co x intermetallic compounds and selected hydrides and deuterides of this system have been studied by various techniques, including magnetic measurements, in situ X-ray and neutron powder diffraction. The intermetallic compounds crystallize in a SnMgCu 4 -type structure and magnetically order below a Curie temperature (T C ), which increases exponentially with the Co content. This can be due to the ordering of the Co sublattice. On the other hand, the insertion of D or H in TbMgNiCo 3 strongly decreases T C . The X-ray diffraction measurements versus temperature reveal cell volume minima at T C for the compounds with x = 1−3 without any hints of the structure change. The analysis of the neutron diffraction patterns for the intermetallics with x = 2 and 3 indicates a slightly canted ferrimagnetic structure below T C . The Tb moments refined at 16 K are 4.1(2) μ B /Tb for x = 2, and 6.2(1) μ B /Tb for x = 3, which are smaller than the free ion value (9.5 μ B /Tb). This reduction can be due to the influence of temperature but also reveals the crystal field effect. As Ni and Co occupy statistically the same Wyckoff site, an average Ni/Co moment was refined, leading to 1.7(2) μ B /atom for x = 2 and 1.8(1) μ B /atom for x = 3 at 16 K. This moment is slightly canted compared to the Tb moment.

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Section: Magnetic Properties Of Tbmgni 4−x Comentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

TbMgNi_4–xCo_x–(H,D)₂ System. II: Correlation between Structural and Magnetic Properties

et al. 2023

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“…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.

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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).

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“…Recently, we conducted a detailed study of several 1:1:4 alloy systems and have shown the element substitution effects on structural, hydrogen sorption and electrochemical properties [19][20][21][22][23][24][25]. In some cases the characteristics of the alloys were improved.…”

Section: Introductionmentioning

confidence: 99%

Solid gas and electrochemical hydrogenation of the selected alloys (R’,R’’)2-Mg Ni4-Co (R’, R’’ = Pr, Nd; x = 0.8–1.2; y = 0–2)

Verbovytskyy

Oprysk

Paul‐Boncour

et al. 2021

Journal of Alloys and Compounds

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Electrode Materials Based on LaMgNi4–x Co x (0 ≤ x ≤ 1) Alloys

Cited by 14 publications

References 23 publications

TbMgNi_4–xCo_x–(H,D)₂ System. II: Correlation between Structural and Magnetic Properties

TbMgNi_4–xCo_x–(H,D)₂ System. II: Correlation between Structural and Magnetic Properties

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

Solid gas and electrochemical hydrogenation of the selected alloys (R’,R’’)2-Mg Ni4-Co (R’, R’’ = Pr, Nd; x = 0.8–1.2; y = 0–2)

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Electrode Materials Based on LaMgNi4–x Co x (0 ≤ x ≤ 1) Alloys

Cited by 14 publications

References 23 publications

TbMgNi4–xCox–(H,D)2 System. II: Correlation between Structural and Magnetic Properties

TbMgNi4–xCox–(H,D)2 System. II: Correlation between Structural and Magnetic Properties

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

Solid gas and electrochemical hydrogenation of the selected alloys (R’,R’’)2-Mg Ni4-Co (R’, R’’ = Pr, Nd; x = 0.8–1.2; y = 0–2)

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TbMgNi_4–xCo_x–(H,D)₂ System. II: Correlation between Structural and Magnetic Properties

TbMgNi_4–xCo_x–(H,D)₂ System. II: Correlation between Structural and Magnetic Properties