Search results for: I.Yu. Zavaliy

Items from 1 to 20 out of 28 results

article

Y6Mg9Co2 and Y9Mg30Co2: Novel magnesium-rich compounds representing new structure types

V.V. Shtender, V.V. Pavlyuk, R.V. Denys, J.-C. Crivello, more

Journal of Alloys and Compounds > 2018 > 737 > C > 613-622

The crystal structures of the magnesium-rich Y₆Mg₉Co₂ and Y₉Mg₃₀Co₂ compounds have been determined from single crystal X-ray diffraction data. Both compounds represent new structure types: Y₆Mg₉Co₂ is orthorhombic, Pnnm, oP34, a = 8.7883 (2), b = 15.9669 (3), c = 5.9984 (2) Å; Y₉Mg₃₀Co₂ is hexagonal, P6₃/mmc, hP82, a = 10.1564 (3), c = 22.498 (1) Å. The crystal structures of these compounds are discussed...

article

Phase equilibria in the Nd–Mg–Co system at 300 and 500 °C, crystal structure and hydrogenation behavior of selected compounds

V.V. Shtender, O.Ya. Zelinska, V.V. Pavlyuk, R.V. Denys, more

Intermetallics > 2017 > 87 > C > 61-69

The isothermal sections of the Nd–Mg–Co phase diagram at 300 and 500 °C have been constructed on the basis of X-ray diffraction (XRD), Wavelength Dispersive Spectrometry (WDS) and Electron Probe Micro Analyzer (EPMA) analysis. The existence of two ternary compounds Nd₄Mg₃Co₂ (own structure type) and Nd₄MgCo (Gd₄RhIn type) was confirmed. The latter has homogeneity range defined as Nd_4-xMg_1+xCo with...

article

Crystal structure, hydrogen absorption-desorption behavior and magnetic properties of the Nd3−xMgxCo9 alloys

V.V. Shtender, R.V. Denys, V. Paul-Boncour, I.Yu. Zavaliy, more

Journal of Alloys and Compounds > 2017 > 695 > C > 1426-1435

New Nd_3−xMg_xCo₉ alloys have been synthesized by powder sintering method and their crystal structure, hydrogen storage and magnetic properties have been systematically studied. X-ray diffraction analysis showed that Nd_3−xMg_xCo₉ (x ≤ 1.5) alloys belong to the PuNi₃-type structure and NdMg₂Co₉ is an individual ternary compound with YIn₂Ni₉-type structure. Hydrogen storage capacity of the PuNi₃-type Nd...

article

Phase equilibria in the Tb-Mg-Co system at 500°C, crystal structure and hydrogenation properties of selected compounds

V.V. Shtender, R.V. Denys, I.Yu. Zavaliy, O.Ya. Zelinska, more

Journal of Solid State Chemistry > 2015 > 232 > C > 228-235

The isothermal section of the Tb–Mg–Co phase diagram at 500°C has been built on the basis of XRD analysis of forty samples prepared by powder metallurgy. The existence of two ternary compounds Tb₄Mg₃Co₂ and Tb₄MgCo was confirmed. The formation of two solid solutions, Tb_1−xMg_xCo₃ (0≤x≤0.4) and Tb_1-−xMg_xCo₂ (0≤x≤0.6), was found for the first time. It is shown that Tb₅Mg₂₄ also dissolves a small amount...

article

Hydrogenation behavior of the R4MgCo (R=Y, La, Nd, Tb) compounds

V.V. Shtender, V. Paul-Boncour, A.B. Riabov, R.V. Denys, more

Journal of Solid State Chemistry > 2015 > 229 > C > 135-140

The hydrogen absorption properties of the R₄MgCo compounds (R=Y, La, Nd, Tb; str. type Gd₄RhIn; sp.gr. F4¯3m) have been studied for the first time. It was shown that their hydrogen storage capacity reaches about 2wt%. At low pressure hydrogenation and moderately elevated temperatures the formed hydrides preserve the original structure of the metallic matrix. The crystal structure of the R₄MgCoH_x hydrides...

article

Effect of Co substitution on hydrogenation and magnetic properties of NdMgNi4 alloy

V.V. Shtender, R.V. Denys, V. Paul-Boncour, Yu.V. Verbovytskyy, more

Journal of Alloys and Compounds > 2015 > 639 > C > 526-532

The influence of Co substitution on the structural and magnetic properties of NdMgNi₄₋_xCo_x (x⩽3) alloys and their hydrides has been investigated. The formation of NdMgCo₄ compound has not been observed. The gas hydrogenation of these alloys resulted in the formation of NdMgNi₄H₄, NdMgNi₃CoH_4.8, NdMgNi₂Co₂H_5.6 and NdMgNiCo₃H_6.2 hydrides. Transformation from cubic into orthorhombic structure upon hydrogenation...

article

Hydrogenation properties and crystal structure of YMgT4 (Т=Co, Ni, Cu) compounds

V.V. Shtender, R.V. Denys, V. Paul-Boncour, A.B. Riabov, more

Journal of Alloys and Compounds > 2014 > 603 > C > 7-13

New two ternary YMgCo₄ and YMgCu₄ and one quaternary YMgCo₂Ni₂ compounds have been synthesized by mechanical alloying with further annealing. The hydrogenation capacity of YMgCo₄ reaches 6.8at.H/f.u. The Pressure-Composition-Temperature studies of YMgCo₄–H₂ and YMgNi₄–H₂ systems revealed that introduction of magnesium, accompanied by shrinking of the unit cell, decreases the stability of hydrides...

article

Electronic structure of Zr4Fe2O: Ab initio APW+LO calculations and X-ray spectroscopy studies

A.A. Lavrentyev, B.V. Gabrelian, P.N. Shkumat, I.Ya. Nikiforov, more

Journal of Physics and Chemistry of Solids > 2013 > 74 > 4 > 590-594

First-principles band-structure augmented plane wave +local orbitals (APW+LO) calculations as incorporated in the WIEN2k code as well as X-ray photoelectron spectroscopy (XPS) and X-ray emission spectroscopy (XES) measurements are performed to elucidate the electronic structure of Zr ₄ Fe ₂ O oxide, a very prospective hydrogen-storage material. Total and partial densities of states...

article

Phase equilibria in the Mg–Ti–Ni system at 500 °C and hydrogenation properties of selected alloys

R.V. Denys, I.Yu. Zavaliy, V.V. Berezovets, V. Paul-Boncour, more

Intermetallics > 2013 > 32 > Complete > 167-175

A number of ternary Mg–Ti–Ni alloys have been synthesized by high energy ball milling, followed by annealing heat treatment. On the basis of X-ray phase analysis of these alloys an isothermal section of the Mg–Ti–Ni phase diagram at 500 °C has been constructed. One ternary intermetallic compound with Mg ₃ TiNi ₂ stoichiometry that adopts an ordered Ti ₂ Ni-type structure has...

article

First-principles FP-LAPW calculations and X-ray spectroscopy studies of the electronic structure of Zr3V3O and Zr3V3O0.6 oxides

O.Yu. Khyzhun, V.L. Bekenev, M.V. Karpets, I.Yu. Zavaliy

Journal of Physics and Chemistry of Solids > 2012 > 73 > 11 > 1302-1308

Electronic properties of Zr ₃ V ₃ O oxide, a very promising hydrogen-storage material, were studied both from theoretical and experimental points of view employing the full potential linearized augmented plane wave (FP-LAPW) method as well as X-ray photoelectron spectroscopy (XPS) and X-ray emission spectroscopy (XES). Total and partial densities of states of the constituting atoms...

article

First-principles APW + LO calculations and X-ray spectroscopy studies of the electronic structure of Zr6FeAl2

A.A. Lavrentyev, B.V. Gabrelian, P.N. Shkumat, I.Ya. Nikiforov, more

Materials Chemistry and Physics > 2012 > 136 > 2-3 > 980-984

Electronic structure of zirconium iron aluminide, Zr ₆ FeAl ₂ , a very prospective hydrogen-storage intermetallic compound, has been studied from both theoretical and experimental viewpoints. In the present paper first-principles band-structure augmented plane wave + local orbitals (APW + LO) calculations as incorporated in the WIEN2k code as well as X-ray photoelectron spectroscopy...

article

New CeMgCo4 and Ce2MgCo9 compounds: Hydrogenation properties and crystal structure of hydrides

R.V. Denys, A.B. Riabov, R. Černý, I.V. Koval'chuk, more

Journal of Solid State Chemistry > 2012 > 187 > Complete > 1-6

Two new ternary intermetallic compounds, CeMgCo ₄ (C15b pseudo-Laves phase, MgCu ₄ Sn type) and Ce ₂ MgCo ₉ (substitution derivative of PuNi ₃ type) were synthesized by mechanical alloying method. The structural and hydrogenation properties of these compounds were studied by X-ray diffraction and Pressure–Composition–Temperature measurements. Both compounds...

article

Crystal structure of the novel Mg3MnNi2D3−x interstitial deuteride

R.V. Denys, A.R. Riabov, V.V. Berezovets, I.V. Koval’chuk, more

Intermetallics > 2011 > 19 > 10 > 1563-1566

A novel low-temperature hydride, Mg ₃ MnNi ₂ D _3−x with filled Ti ₂ Ni-type structure has been synthesised and its crystal structure has been studied in detail by powder neutron diffraction. Refinement of the structures of β-Mg ₃ MnNi ₂ D _1.83 and α-Mg ₃ MnNi ₂ D _0.23 deuteride phases showed that D atoms partially fill...

article

Electronic structure of Ti4Fe2Ox as determined from first-principles APW+LO calculations and X-ray spectroscopy data

A.A. Lavrentyev, B.V. Gabrelian, P.N. Shkumat, I.Ya. Nikiforov, more

Journal of Alloys and Compounds > 2010 > 492 > 1-2 > 39-43

Electronic properties of Ti ₄ Fe ₂ O oxide, a very promising hydrogen-storage material, were studied both from theoretical and experimental points of view employing the first-principles band-structure augmented plane wave+local orbitals (APW+LO) method with the WIEN2k code as well as X-ray photoelectron spectroscopy (XPS) and soft X-ray emission spectroscopy (SXES). Total and partial...

article

Vanadium-based BCC alloys: phase-structural characteristics and hydrogen sorption properties

M.V. Lototsky, V.A. Yartys, I.Yu. Zavaliy

Journal of Alloys and Compounds > 2005 > 404-406 > Complete > 421-426

This work was focused on the studies of vanadium-based “low-temperature” bcc alloys as H storage materials. Both as cast and annealed at 1100 ° C quaternary alloys V _92.5−x−y Zr _7.5 Ti _7.5+x−y M _y (M = Cr, Mn, Fe, Co, Ni; x=0, 10; y=0, 7.5) were studied. They were characterised by XRD, PCT hydrogen absorption–desorption measurements (T=30 –120 ° C) and thermal desorption...

article

Synthesis and crystal structure of κ-Zr9V4SH∼23

I.Yu. Zavaliy, R. Černý, I.V. Koval’chuck, A.B. Riabov, more

Journal of Alloys and Compounds > 2005 > 404-406 > Complete > 118-121

The Zr ₉ V ₄ SH _∼23 hydride was synthesized by saturation from gaseous hydrogen at room temperature and 0.12 MPa hydrogen pressure. The measured hydrogen absorption capacity of the κ-Zr ₉ V ₄ S was 1.77 H/M. The refinement of the hydride structure with the use of X-ray powder diffraction data confirmed the preserved symmetry of the metallic matrix (sp.gr. P63...

article

Structural studies of pseudobinary La(Cu1−xNix)2 compounds and their hydrides

R.V. Denys, I.Yu. Zavaliy, R. Černý, I.V. Koval’chuck

Journal of Alloys and Compounds > 2005 > 396 > 1-2 > 139-142

The effect of Cu-for-Ni substitution on the structural and hydrogenation properties of the LaCu ₂ compound with hexagonal AlB ₂ type structure has been studied. An extended solid solution was found from LaCu ₂ to La(Cu _0.35 Ni _0.65 ) ₂ . The La(Cu _1−x Ni _x ) ₂ compounds easily absorb hydrogen at room temperature under 1bar pressure,...

article

Hydrogen-induced changes in crystal structure and magnetic properties of the Zr ₃ MO _x (M = Fe, Co) phases

I.Yu. Zavaliy, R.V. Denys, R. Černý, I.V. Koval’chuck, more

Journal of Alloys and Compounds > 2005 > 386 > 1-2 > 26-34

It is shown that the oxygen-stabilised compounds Zr ₃ Fe(Co)O _x (x = 0-1.0) interact with hydrogen at ambient temperature and pressure forming saturated hydrides with filled Re ₃ B type structure. The hydrogen storage capacity decreases with increasing oxygen content from 6.7 H/f.u. for Zr ₃ Fe down to 5.35 H/f.u. for Zr ₃ FeO ₁ _. ₀ and from...

article

Hydrogenation of oxygen-stabilized Zr ₃ NiO _x compounds

I.Yu. Zavaliy, R. Černý, I.V. Koval’chuck, I.V. Saldan

Journal of Alloys and Compounds > 2003 > 360 > 1-2 > 173-182

It is shown that oxygen-stabilized compounds Zr ₃ NiO _x (x=0.4, 0.6, 0.8, 1.0) interact with hydrogen at ambient temperature and pressure forming saturated hydrides with a filled Re ₃ B-type structure. The hydrogen storage capacity decreases with increasing oxygen content from 6.65 H/f.u. for Zr ₃ NiO ₀ _. ₄ down to 5.58 H/f.u. for Zr ₃ NiO ...

article

Interaction of hydrogen with RECu ₂ and RE(Cu,Ni) ₂ intermetallic compounds (RE=Y, Pr, Dy, Ho)

I.Yu. Zavaliy, R. C̆erný, V.N. Verbetsky, R.V. Denys, more

Journal of Alloys and Compounds > 2003 > 358 > 1-2 > 146-151

Hydrogenation of RECu ₂ (RE=Dy, Ho, Y) at room temperature and pressures of 100-1500-bar H ₂ has not resulted in the formation of ternary hydrides. The interaction of hydrogen with Pr(Cu ₁ _- _x Ni _x ) ₂ (x=0, 0.1, 0.17, 0.25, 0.32) at room temperature and pressure of 25 bar resulted in the formation of Pr(Cu ₁ _- _x Ni _x ) ₂...

Publication date

Set your own date range

INFONA - science communication portal

Search results for: I.Yu. Zavaliy

Y6Mg9Co2 and Y9Mg30Co2: Novel magnesium-rich compounds representing new structure types

Phase equilibria in the Nd–Mg–Co system at 300 and 500 °C, crystal structure and hydrogenation behavior of selected compounds

Crystal structure, hydrogen absorption-desorption behavior and magnetic properties of the Nd3−xMgxCo9 alloys

Phase equilibria in the Tb-Mg-Co system at 500°C, crystal structure and hydrogenation properties of selected compounds

Hydrogenation behavior of the R4MgCo (R=Y, La, Nd, Tb) compounds

Effect of Co substitution on hydrogenation and magnetic properties of NdMgNi4 alloy

Hydrogenation properties and crystal structure of YMgT4 (Т=Co, Ni, Cu) compounds

Electronic structure of Zr4Fe2O: Ab initio APW+LO calculations and X-ray spectroscopy studies

Phase equilibria in the Mg–Ti–Ni system at 500 °C and hydrogenation properties of selected alloys

First-principles FP-LAPW calculations and X-ray spectroscopy studies of the electronic structure of Zr3V3O and Zr3V3O0.6 oxides

First-principles APW + LO calculations and X-ray spectroscopy studies of the electronic structure of Zr6FeAl2

New CeMgCo4 and Ce2MgCo9 compounds: Hydrogenation properties and crystal structure of hydrides

Crystal structure of the novel Mg3MnNi2D3−x interstitial deuteride

Electronic structure of Ti4Fe2Ox as determined from first-principles APW+LO calculations and X-ray spectroscopy data

Vanadium-based BCC alloys: phase-structural characteristics and hydrogen sorption properties

Synthesis and crystal structure of κ-Zr9V4SH∼23

Structural studies of pseudobinary La(Cu1−xNix)2 compounds and their hydrides

Hydrogen-induced changes in crystal structure and magnetic properties of the Zr ₃ MO _x (M = Fe, Co) phases

Hydrogenation of oxygen-stabilized Zr ₃ NiO _x compounds

Interaction of hydrogen with RECu ₂ and RE(Cu,Ni) ₂ intermetallic compounds (RE=Y, Pr, Dy, Ho)

Filter options

Publication date

Content availability

Keywords

Journal

INFONA - science communication portal

Search results for: I.Yu. Zavaliy

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Keywords

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options